diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 346544d..bbc2aca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,6 +27,7 @@ jobs:
 
       - name: Install system packages
         run: |
+          sudo apt-get update
           sudo apt-get install -y ffmpeg libsndfile1
 
       - name: Install pip packages from requirements.txt
diff --git a/.gitignore b/.gitignore
index 936865c..60dae11 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,9 @@ __pycache__/
 # Cog
 .cog/
 
+# Random stuff I don't care about
+.graveyard/
+
 # Distribution / packaging
 .Python
 build/
diff --git a/riffusion/datatypes.py b/riffusion/datatypes.py
index 70c77e0..99f1c2d 100644
--- a/riffusion/datatypes.py
+++ b/riffusion/datatypes.py
@@ -19,6 +19,9 @@ class PromptInput:
     # Random seed for denoising
     seed: int
 
+    # Negative prompt to avoid (optional)
+    negative_prompt: T.Optional[str] = None
+
     # Denoising strength
     denoising: float = 0.75
 
diff --git a/riffusion/streamlit/pages/audio_to_audio.py b/riffusion/streamlit/pages/audio_to_audio.py
index 4aa1fbc..71062b0 100644
--- a/riffusion/streamlit/pages/audio_to_audio.py
+++ b/riffusion/streamlit/pages/audio_to_audio.py
@@ -6,8 +6,11 @@ import pydub
 import streamlit as st
 from PIL import Image
 
+from riffusion.datatypes import InferenceInput, PromptInput
 from riffusion.spectrogram_params import SpectrogramParams
 from riffusion.streamlit import util as streamlit_util
+from riffusion.streamlit.pages.interpolation import get_prompt_inputs, run_interpolation
+from riffusion.util import audio_util
 
 
 def render_audio_to_audio() -> None:
@@ -37,6 +40,19 @@ def render_audio_to_audio() -> None:
 
     device = streamlit_util.select_device(st.sidebar)
 
+    num_inference_steps = T.cast(
+        int,
+        st.sidebar.number_input(
+            "Steps per sample", value=50, help="Number of denoising steps per model run"
+        ),
+    )
+
+    guidance = st.sidebar.number_input(
+        "Guidance",
+        value=7.0,
+        help="How much the model listens to the text prompt",
+    )
+
     audio_file = st.file_uploader(
         "Upload audio",
         type=["mp3", "m4a", "ogg", "wav", "flac", "webm"],
@@ -53,113 +69,58 @@ def render_audio_to_audio() -> None:
     segment = streamlit_util.load_audio_file(audio_file)
 
     # TODO(hayk): Fix
-    segment = segment.set_frame_rate(44100)
+    if segment.frame_rate != 44100:
+        st.warning("Audio must be 44100Hz. Converting")
+        segment = segment.set_frame_rate(44100)
     st.write(f"Duration: {segment.duration_seconds:.2f}s, Sample Rate: {segment.frame_rate}Hz")
 
-    if "counter" not in st.session_state:
-        st.session_state.counter = 0
+    clip_p = get_clip_params()
+    start_time_s = clip_p["start_time_s"]
+    clip_duration_s = clip_p["clip_duration_s"]
+    overlap_duration_s = clip_p["overlap_duration_s"]
 
-    def increment_counter():
-        st.session_state.counter += 1
-
-    cols = st.columns(4)
-    start_time_s = cols[0].number_input(
-        "Start Time [s]",
-        min_value=0.0,
-        value=0.0,
-    )
-    duration_s = cols[1].number_input(
-        "Duration [s]",
-        min_value=0.0,
-        value=15.0,
-    )
-    clip_duration_s = cols[2].number_input(
-        "Clip Duration [s]",
-        min_value=3.0,
-        max_value=10.0,
-        value=5.0,
-    )
-    overlap_duration_s = cols[3].number_input(
-        "Overlap Duration [s]",
-        min_value=0.0,
-        max_value=10.0,
-        value=0.2,
-    )
-
-    duration_s = min(duration_s, segment.duration_seconds - start_time_s)
+    duration_s = min(clip_p["duration_s"], segment.duration_seconds - start_time_s)
     increment_s = clip_duration_s - overlap_duration_s
     clip_start_times = start_time_s + np.arange(0, duration_s - clip_duration_s, increment_s)
-    st.write(
-        f"Slicing {len(clip_start_times)} clips of duration {clip_duration_s}s "
-        f"with overlap {overlap_duration_s}s."
+
+    write_clip_details(
+        clip_start_times=clip_start_times,
+        clip_duration_s=clip_duration_s,
+        overlap_duration_s=overlap_duration_s,
     )
 
-    with st.expander("Clip Times"):
-        st.dataframe(
-            {
-                "Start Time [s]": clip_start_times,
-                "End Time [s]": clip_start_times + clip_duration_s,
-                "Duration [s]": clip_duration_s,
-            }
-        )
+    interpolate = st.checkbox("Interpolate between two settings", False)
 
-    with st.form("Conversion Params"):
+    with st.form("audio to audio form"):
+        if interpolate:
+            left, right = st.columns(2)
 
-        prompt = st.text_input("Text Prompt")
-        negative_prompt = st.text_input("Negative Prompt")
+            with left:
+                st.write("##### Prompt A")
+                prompt_input_a = PromptInput(guidance=guidance, **get_prompt_inputs(key="a"))
 
-        cols = st.columns(4)
-        denoising_strength = cols[0].number_input(
-            "Denoising Strength",
-            min_value=0.0,
-            max_value=1.0,
-            value=0.45,
-        )
-        guidance_scale = cols[1].number_input(
-            "Guidance Scale",
-            min_value=0.0,
-            max_value=20.0,
-            value=7.0,
-        )
-        num_inference_steps = int(
-            cols[2].number_input(
-                "Num Inference Steps",
-                min_value=1,
-                max_value=150,
-                value=50,
+            with right:
+                st.write("##### Prompt B")
+                prompt_input_b = PromptInput(guidance=guidance, **get_prompt_inputs(key="b"))
+
+        else:
+            prompt_input_a = PromptInput(
+                guidance=guidance,
+                **get_prompt_inputs(key="a", include_negative_prompt=True, cols=True),
             )
-        )
 
-        seed = int(
-            cols[3].number_input(
-                "Seed",
-                min_value=0,
-                value=42,
-            )
-        )
-
-        submit_button = st.form_submit_button("Convert", on_click=increment_counter)
-
-    # TODO fix
+        submit_button = st.form_submit_button("Riff", type="primary")
 
     show_clip_details = st.sidebar.checkbox("Show Clip Details", True)
     show_difference = st.sidebar.checkbox("Show Difference", False)
 
-    clip_segments: T.List[pydub.AudioSegment] = []
-    for i, clip_start_time_s in enumerate(clip_start_times):
-        clip_start_time_ms = int(clip_start_time_s * 1000)
-        clip_duration_ms = int(clip_duration_s * 1000)
-        clip_segment = segment[clip_start_time_ms : clip_start_time_ms + clip_duration_ms]
+    clip_segments = slice_audio_into_clips(
+        segment=segment,
+        clip_start_times=clip_start_times,
+        clip_duration_s=clip_duration_s,
+    )
 
-        # TODO(hayk): I don't think this is working properly
-        if i == len(clip_start_times) - 1:
-            silence_ms = clip_duration_ms - int(clip_segment.duration_seconds * 1000)
-            if silence_ms > 0:
-                clip_segment = clip_segment.append(pydub.AudioSegment.silent(duration=silence_ms))
-
-        clip_segments.append(clip_segment)
-
-    if not prompt:
+    if not prompt_input_a.prompt:
         st.info("Enter a prompt")
         return
 
@@ -168,10 +129,16 @@ def render_audio_to_audio() -> None:
 
     params = SpectrogramParams()
 
+    if interpolate:
+        # TODO(hayk): Make not linspace
+        alphas = list(np.linspace(0, 1, len(clip_segments)))
+        alphas_str = ", ".join([f"{alpha:.2f}" for alpha in alphas])
+        st.write(f"**Alphas** : [{alphas_str}]")
+
     result_images: T.List[Image.Image] = []
     result_segments: T.List[pydub.AudioSegment] = []
     for i, clip_segment in enumerate(clip_segments):
-        st.write(f"### Clip {i} at {clip_start_times[i]}s")
+        st.write(f"### Clip {i} at {clip_start_times[i]:.2f}s")
 
         audio_bytes = io.BytesIO()
         clip_segment.export(audio_bytes, format="wav")
@@ -183,10 +150,7 @@ def render_audio_to_audio() -> None:
         )
 
         # TODO(hayk): Roll this into spectrogram_image_from_audio?
-        # TODO(hayk): Scale something when computing audio
-        closest_width = int(np.ceil(init_image.width / 32) * 32)
-        closest_height = int(np.ceil(init_image.height / 32) * 32)
-        init_image_resized = init_image.resize((closest_width, closest_height), Image.BICUBIC)
+        init_image_resized = scale_image_to_32_stride(init_image)
 
         progress_callback = None
         if show_clip_details:
@@ -203,17 +167,32 @@ def render_audio_to_audio() -> None:
                 progress = st.progress(0.0)
                 progress_callback = progress.progress
 
-        image = streamlit_util.run_img2img(
-            prompt=prompt,
-            init_image=init_image_resized,
-            denoising_strength=denoising_strength,
-            num_inference_steps=num_inference_steps,
-            guidance_scale=guidance_scale,
-            negative_prompt=negative_prompt,
-            seed=seed,
-            progress_callback=progress_callback,
-            device=device,
-        )
+        if interpolate:
+            inputs = InferenceInput(
+                alpha=float(alphas[i]),
+                num_inference_steps=num_inference_steps,
+                seed_image_id="og_beat",
+                start=prompt_input_a,
+                end=prompt_input_b,
+            )
+
+            image, audio_bytes = run_interpolation(
+                inputs=inputs,
+                init_image=init_image_resized,
+                device=device,
+            )
+        else:
+            image = streamlit_util.run_img2img(
+                prompt=prompt_input_a.prompt,
+                init_image=init_image_resized,
+                denoising_strength=prompt_input_a.denoising,
+                num_inference_steps=num_inference_steps,
+                guidance_scale=guidance,
+                negative_prompt=prompt_input_a.negative_prompt,
+                seed=prompt_input_a.seed,
+                progress_callback=progress_callback,
+                device=device,
+            )
 
         # Resize back to original size
         image = image.resize(init_image.size, Image.BICUBIC)
@@ -253,10 +232,7 @@ def render_audio_to_audio() -> None:
             st.audio(audio_bytes)
 
     # Combine clips with a crossfade based on overlap
-    crossfade_ms = int(overlap_duration_s * 1000)
-    combined_segment = result_segments[0]
-    for segment in result_segments[1:]:
-        combined_segment = combined_segment.append(segment, crossfade=crossfade_ms)
+    combined_segment = audio_util.stitch_segments(result_segments, crossfade_s=overlap_duration_s)
 
     audio_bytes = io.BytesIO()
     combined_segment.export(audio_bytes, format="mp3")
@@ -264,11 +240,99 @@ def render_audio_to_audio() -> None:
     st.audio(audio_bytes, format="audio/mp3")
 
 
-@st.cache
-def test(segment: pydub.AudioSegment, counter: int) -> int:
-    st.write("#### Trimmed")
-    st.write(segment.duration_seconds)
-    return counter
+def get_clip_params(advanced: bool = False) -> T.Dict[str, T.Any]:
+    """
+    Render the parameters of slicing audio into clips.
+    """
+    p: T.Dict[str, T.Any] = {}
+
+    cols = st.columns(4)
+
+    p["start_time_s"] = cols[0].number_input(
+        "Start Time [s]",
+        min_value=0.0,
+        value=0.0,
+    )
+    p["duration_s"] = cols[1].number_input(
+        "Duration [s]",
+        min_value=0.0,
+        value=15.0,
+    )
+
+    if advanced:
+        p["clip_duration_s"] = cols[2].number_input(
+            "Clip Duration [s]",
+            min_value=3.0,
+            max_value=10.0,
+            value=5.0,
+        )
+    else:
+        p["clip_duration_s"] = 5.0
+
+    if advanced:
+        p["overlap_duration_s"] = cols[3].number_input(
+            "Overlap Duration [s]",
+            min_value=0.0,
+            max_value=10.0,
+            value=0.2,
+        )
+    else:
+        p["overlap_duration_s"] = 0.2
+
+    return p
+
+
+def write_clip_details(
+    clip_start_times: np.ndarray, clip_duration_s: float, overlap_duration_s: float
+):
+    """
+    Write details of the clips to be sliced from an audio segment.
+    """
+    clip_details_text = (
+        f"Slicing {len(clip_start_times)} clips of duration {clip_duration_s}s "
+        f"with overlap {overlap_duration_s}s"
+    )
+
+    with st.expander(clip_details_text):
+        st.dataframe(
+            {
+                "Start Time [s]": clip_start_times,
+                "End Time [s]": clip_start_times + clip_duration_s,
+                "Duration [s]": clip_duration_s,
+            }
+        )
+
+
+def slice_audio_into_clips(
+    segment: pydub.AudioSegment, clip_start_times: T.Sequence[float], clip_duration_s: float
+) -> T.List[pydub.AudioSegment]:
+    """
+    Slice an audio segment into a list of clips of a given duration at the given start times.
+    """
+    clip_segments: T.List[pydub.AudioSegment] = []
+    for i, clip_start_time_s in enumerate(clip_start_times):
+        clip_start_time_ms = int(clip_start_time_s * 1000)
+        clip_duration_ms = int(clip_duration_s * 1000)
+        clip_segment = segment[clip_start_time_ms : clip_start_time_ms + clip_duration_ms]
+
+        # TODO(hayk): I don't think this is working properly
+        if i == len(clip_start_times) - 1:
+            silence_ms = clip_duration_ms - int(clip_segment.duration_seconds * 1000)
+            if silence_ms > 0:
+                clip_segment = clip_segment.append(pydub.AudioSegment.silent(duration=silence_ms))
+
+        clip_segments.append(clip_segment)
+
+    return clip_segments
+
+
+def scale_image_to_32_stride(image: Image.Image) -> Image.Image:
+    """
+    Scale an image to a size that is a multiple of 32.
+    """
+    closest_width = int(np.ceil(image.width / 32) * 32)
+    closest_height = int(np.ceil(image.height / 32) * 32)
+    return image.resize((closest_width, closest_height), Image.BICUBIC)
 
 
 if __name__ == "__main__":
diff --git a/riffusion/streamlit/pages/audio_to_audio_interpolate.py b/riffusion/streamlit/pages/audio_to_audio_interpolate.py
deleted file mode 100644
index 30db96a..0000000
--- a/riffusion/streamlit/pages/audio_to_audio_interpolate.py
+++ /dev/null
@@ -1,247 +0,0 @@
-import io
-import typing as T
-
-import numpy as np
-import pydub
-import streamlit as st
-from PIL import Image
-
-from riffusion.datatypes import InferenceInput
-from riffusion.spectrogram_params import SpectrogramParams
-from riffusion.streamlit import util as streamlit_util
-from riffusion.streamlit.pages.interpolation import get_prompt_inputs, run_interpolation
-
-
-def render_audio_to_audio_interpolate() -> None:
-    st.set_page_config(layout="wide", page_icon="🎸")
-
-    st.subheader(":wave: Audio to Audio Inteprolation")
-    st.write(
-        """
-    Audio to audio with interpolation.
-    """
-    )
-
-    with st.expander("Help", False):
-        st.write(
-            """
-            TODO
-            """
-        )
-
-    device = streamlit_util.select_device(st.sidebar)
-
-    num_inference_steps = T.cast(
-        int,
-        st.sidebar.number_input(
-            "Steps per sample", value=50, help="Number of denoising steps per model run"
-        ),
-    )
-
-    audio_file = st.file_uploader(
-        "Upload audio",
-        type=["mp3", "m4a", "ogg", "wav", "flac", "webm"],
-        label_visibility="collapsed",
-    )
-
-    if not audio_file:
-        st.info("Upload audio to get started")
-        return
-
-    st.write("#### Original")
-    st.audio(audio_file)
-
-    segment = streamlit_util.load_audio_file(audio_file)
-
-    # TODO(hayk): Fix
-    segment = segment.set_frame_rate(44100)
-    st.write(f"Duration: {segment.duration_seconds:.2f}s, Sample Rate: {segment.frame_rate}Hz")
-
-    if "counter" not in st.session_state:
-        st.session_state.counter = 0
-
-    def increment_counter():
-        st.session_state.counter += 1
-
-    cols = st.columns(4)
-    start_time_s = cols[0].number_input(
-        "Start Time [s]",
-        min_value=0.0,
-        value=0.0,
-    )
-    duration_s = cols[1].number_input(
-        "Duration [s]",
-        min_value=0.0,
-        value=15.0,
-    )
-    clip_duration_s = cols[2].number_input(
-        "Clip Duration [s]",
-        min_value=3.0,
-        max_value=10.0,
-        value=5.0,
-    )
-    overlap_duration_s = cols[3].number_input(
-        "Overlap Duration [s]",
-        min_value=0.0,
-        max_value=10.0,
-        value=0.2,
-    )
-
-    duration_s = min(duration_s, segment.duration_seconds - start_time_s)
-    increment_s = clip_duration_s - overlap_duration_s
-    clip_start_times = start_time_s + np.arange(0, duration_s - clip_duration_s, increment_s)
-    st.write(
-        f"Slicing {len(clip_start_times)} clips of duration {clip_duration_s}s "
-        f"with overlap {overlap_duration_s}s."
-    )
-
-    with st.expander("Clip Times"):
-        st.dataframe(
-            {
-                "Start Time [s]": clip_start_times,
-                "End Time [s]": clip_start_times + clip_duration_s,
-                "Duration [s]": clip_duration_s,
-            }
-        )
-
-    with st.form(key="interpolation_form"):
-        left, right = st.columns(2)
-
-        with left:
-            st.write("##### Prompt A")
-            prompt_input_a = get_prompt_inputs(key="a")
-
-        with right:
-            st.write("##### Prompt B")
-            prompt_input_b = get_prompt_inputs(key="b")
-
-        submit_button = st.form_submit_button("Generate", type="primary")
-
-    show_clip_details = st.sidebar.checkbox("Show Clip Details", True)
-    show_difference = st.sidebar.checkbox("Show Difference", False)
-
-    clip_segments: T.List[pydub.AudioSegment] = []
-    for i, clip_start_time_s in enumerate(clip_start_times):
-        clip_start_time_ms = int(clip_start_time_s * 1000)
-        clip_duration_ms = int(clip_duration_s * 1000)
-        clip_segment = segment[clip_start_time_ms : clip_start_time_ms + clip_duration_ms]
-
-        # TODO(hayk): I don't think this is working properly
-        if i == len(clip_start_times) - 1:
-            silence_ms = clip_duration_ms - int(clip_segment.duration_seconds * 1000)
-            if silence_ms > 0:
-                clip_segment = clip_segment.append(pydub.AudioSegment.silent(duration=silence_ms))
-
-        clip_segments.append(clip_segment)
-
-    if not prompt_input_a.prompt or not prompt_input_b.prompt:
-        st.info("Enter both prompts to interpolate between them")
-        return
-
-    if not submit_button:
-        return
-
-    params = SpectrogramParams()
-
-    # TODO(hayk): Make not linspace
-    alphas = list(np.linspace(0, 1, len(clip_segments)))
-    alphas_str = ", ".join([f"{alpha:.2f}" for alpha in alphas])
-    st.write(f"**Alphas** : [{alphas_str}]")
-
-    result_images: T.List[Image.Image] = []
-    result_segments: T.List[pydub.AudioSegment] = []
-    for i, clip_segment in enumerate(clip_segments):
-        st.write(f"### Clip {i} at {clip_start_times[i]}s")
-
-        audio_bytes = io.BytesIO()
-        clip_segment.export(audio_bytes, format="wav")
-
-        init_image = streamlit_util.spectrogram_image_from_audio(
-            clip_segment,
-            params=params,
-            device=device,
-        )
-
-        # TODO(hayk): Roll this into spectrogram_image_from_audio?
-        # TODO(hayk): Scale something when computing audio
-        closest_width = int(np.ceil(init_image.width / 32) * 32)
-        closest_height = int(np.ceil(init_image.height / 32) * 32)
-        init_image_resized = init_image.resize((closest_width, closest_height), Image.BICUBIC)
-
-        # progress_callback = None
-        if show_clip_details:
-            left, right = st.columns(2)
-
-            left.write("##### Source Clip")
-            left.image(init_image, use_column_width=False)
-            left.audio(audio_bytes)
-
-            right.write("##### Riffed Clip")
-            empty_bin = right.empty()
-            with empty_bin.container():
-                st.info("Riffing...")
-                # progress = st.progress(0.0)
-                # progress_callback = progress.progress
-
-        inputs = InferenceInput(
-            alpha=float(alphas[i]),
-            num_inference_steps=num_inference_steps,
-            seed_image_id="og_beat",
-            start=prompt_input_a,
-            end=prompt_input_b,
-        )
-
-        image, audio_bytes = run_interpolation(
-            inputs=inputs,
-            init_image=init_image_resized,
-            device=device,
-        )
-
-        # Resize back to original size
-        image = image.resize(init_image.size, Image.BICUBIC)
-
-        result_images.append(image)
-
-        if show_clip_details:
-            empty_bin.empty()
-            right.image(image, use_column_width=False)
-
-        riffed_segment = streamlit_util.audio_segment_from_spectrogram_image(
-            image=image,
-            params=params,
-            device=device,
-        )
-        result_segments.append(riffed_segment)
-
-        if show_clip_details:
-            right.audio(audio_bytes)
-
-        if show_clip_details and show_difference:
-            diff_np = np.maximum(
-                0, np.asarray(init_image).astype(np.float32) - np.asarray(image).astype(np.float32)
-            )
-            diff_image = Image.fromarray(255 - diff_np.astype(np.uint8))
-            diff_segment = streamlit_util.audio_segment_from_spectrogram_image(
-                image=diff_image,
-                params=params,
-                device=device,
-            )
-
-            audio_bytes = io.BytesIO()
-            diff_segment.export(audio_bytes, format="wav")
-            st.audio(audio_bytes)
-
-    # Combine clips with a crossfade based on overlap
-    crossfade_ms = int(overlap_duration_s * 1000)
-    combined_segment = result_segments[0]
-    for segment in result_segments[1:]:
-        combined_segment = combined_segment.append(segment, crossfade=crossfade_ms)
-
-    audio_bytes = io.BytesIO()
-    combined_segment.export(audio_bytes, format="mp3")
-    st.write(f"#### Final Audio ({combined_segment.duration_seconds}s)")
-    st.audio(audio_bytes, format="audio/mp3")
-
-
-if __name__ == "__main__":
-    render_audio_to_audio_interpolate()
diff --git a/riffusion/streamlit/pages/interpolation.py b/riffusion/streamlit/pages/interpolation.py
index f42ef62..9cde099 100644
--- a/riffusion/streamlit/pages/interpolation.py
+++ b/riffusion/streamlit/pages/interpolation.py
@@ -61,6 +61,12 @@ def render_interpolation() -> None:
         ),
     )
 
+    guidance = st.sidebar.number_input(
+        "Guidance",
+        value=7.0,
+        help="How much the model listens to the text prompt",
+    )
+
     init_image_name = st.sidebar.selectbox(
         "Seed image",
         # TODO(hayk): Read from directory
@@ -96,11 +102,11 @@ def render_interpolation() -> None:
 
         with left:
             st.write("##### Prompt A")
-            prompt_input_a = get_prompt_inputs(key="a")
+            prompt_input_a = PromptInput(guidance=guidance, **get_prompt_inputs(key="a"))
 
         with right:
             st.write("##### Prompt B")
-            prompt_input_b = get_prompt_inputs(key="b")
+            prompt_input_b = PromptInput(guidance=guidance, **get_prompt_inputs(key="b"))
 
         st.form_submit_button("Generate", type="primary")
 
@@ -108,11 +114,15 @@ def render_interpolation() -> None:
         st.info("Enter both prompts to interpolate between them")
         return
 
-    # TODO(hayk): Make not linspace
     alphas = list(np.linspace(0, 1, num_interpolation_steps))
     alphas_str = ", ".join([f"{alpha:.2f}" for alpha in alphas])
     st.write(f"**Alphas** : [{alphas_str}]")
 
+    # TODO(hayk): Apply scaling to alphas like this
+    # T_shifted = T * 2 - 1
+    # T_sample = (np.abs(T_shifted)**t_scale_power * np.sign(T_shifted) + 1) / 2
+    # T_sample = T_sample * (t_end - t_start) + t_start
+
     if init_image_name == "custom":
         if not init_image_file:
             st.info("Upload a custom seed image")
@@ -171,36 +181,43 @@ def render_interpolation() -> None:
     st.audio(audio_bytes)
 
 
-def get_prompt_inputs(key: str) -> PromptInput:
+def get_prompt_inputs(
+    key: str,
+    include_negative_prompt: bool = False,
+    cols: bool = False,
+) -> T.Dict[str, T.Any]:
     """
     Compute prompt inputs from widgets.
     """
-    prompt = st.text_input("Prompt", label_visibility="collapsed", key=f"prompt_{key}")
-    seed = T.cast(
+    p: T.Dict[str, T.Any] = {}
+
+    # Optionally use columns
+    left, right = T.cast(T.Any, st.columns(2) if cols else (st, st))
+
+    visibility = "visible" if cols else "collapsed"
+    p["prompt"] = left.text_input("Prompt", label_visibility=visibility, key=f"prompt_{key}")
+
+    if include_negative_prompt:
+        p["negative_prompt"] = right.text_input("Negative Prompt", key=f"negative_prompt_{key}")
+
+    p["seed"] = T.cast(
         int,
-        st.number_input(
+        left.number_input(
             "Seed",
             value=42,
             key=f"seed_{key}",
             help="Integer used to generate a random result. Vary this to explore alternatives.",
         ),
     )
-    denoising = st.number_input(
-        "Denoising", value=0.75, key=f"denoising_{key}", help="How much to modify the seed image"
-    )
-    guidance = st.number_input(
-        "Guidance",
-        value=7.0,
-        key=f"guidance_{key}",
-        help="How much the model listens to the text prompt",
+
+    p["denoising"] = right.number_input(
+        "Denoising",
+        value=0.5,
+        key=f"denoising_{key}",
+        help="How much to modify the seed image",
     )
 
-    return PromptInput(
-        prompt=prompt,
-        seed=seed,
-        denoising=denoising,
-        guidance=guidance,
-    )
+    return p
 
 
 @st.experimental_memo
diff --git a/riffusion/streamlit/pages/split_audio.py b/riffusion/streamlit/pages/split_audio.py
index dc5c235..a69e1b2 100644
--- a/riffusion/streamlit/pages/split_audio.py
+++ b/riffusion/streamlit/pages/split_audio.py
@@ -13,7 +13,7 @@ def render_split_audio() -> None:
     st.subheader(":scissors: Audio Splitter")
     st.write(
         """
-    Split an audio into stems of {vocals, drums, bass, other}.
+    Split an audio into stems of {vocals, drums, bass, piano, guitar, other}.
     """
     )
 
diff --git a/riffusion/streamlit/util.py b/riffusion/streamlit/util.py
index dca6e8f..7d4edc7 100644
--- a/riffusion/streamlit/util.py
+++ b/riffusion/streamlit/util.py
@@ -194,8 +194,8 @@ def run_img2img(
     denoising_strength: float,
     num_inference_steps: int,
     guidance_scale: float,
-    negative_prompt: str,
     seed: int,
+    negative_prompt: T.Optional[str] = None,
     device: str = "cuda",
     progress_callback: T.Optional[T.Callable[[float], T.Any]] = None,
 ) -> Image.Image:
diff --git a/riffusion/util/audio_util.py b/riffusion/util/audio_util.py
index 858c0d1..aa66e7a 100644
--- a/riffusion/util/audio_util.py
+++ b/riffusion/util/audio_util.py
@@ -3,6 +3,7 @@ Audio utility functions.
 """
 
 import io
+import typing as T
 
 import numpy as np
 import pydub
@@ -69,3 +70,16 @@ def apply_filters(segment: pydub.AudioSegment, compression: bool = False) -> pyd
     )
 
     return segment
+
+
+def stitch_segments(
+    segments: T.Sequence[pydub.AudioSegment], crossfade_s: float
+) -> pydub.AudioSegment:
+    """
+    Stitch together a sequence of audio segments with a crossfade between each segment.
+    """
+    crossfade_ms = int(crossfade_s * 1000)
+    combined_segment = segments[0]
+    for segment in segments[1:]:
+        combined_segment = combined_segment.append(segment, crossfade=crossfade_ms)
+    return combined_segment