diff --git a/src/builtin/organya-wavetable-doukutsu.bin b/src/builtin/organya-wavetable-doukutsu.bin
new file mode 100644
index 0000000..4ab3a9f
Binary files /dev/null and b/src/builtin/organya-wavetable-doukutsu.bin differ
diff --git a/src/builtin/pixtone.pcm b/src/builtin/organya-wavetable-org.bin
similarity index 100%
rename from src/builtin/pixtone.pcm
rename to src/builtin/organya-wavetable-org.bin
diff --git a/src/builtin_fs.rs b/src/builtin_fs.rs
index 11df145..23fe7d1 100644
--- a/src/builtin_fs.rs
+++ b/src/builtin_fs.rs
@@ -110,7 +110,7 @@ impl BuiltinFS {
                     FSNode::File("builtin_font.fnt", include_bytes!("builtin/builtin_font.fnt")),
                     FSNode::File("builtin_font_0.png", include_bytes!("builtin/builtin_font_0.png")),
                     FSNode::File("builtin_font_1.png", include_bytes!("builtin/builtin_font_1.png")),
-                    FSNode::File("pixtone.pcm", include_bytes!("builtin/pixtone.pcm")),
+                    FSNode::File("organya-wavetable-doukutsu.bin", include_bytes!("builtin/organya-wavetable-doukutsu.bin")),
                     FSNode::File("touch.png", include_bytes!("builtin/touch.png")),
                     FSNode::Directory("shaders", vec![
                         FSNode::File("basic_150.vert.glsl", include_bytes!("builtin/shaders/basic_150.vert.glsl")),
diff --git a/src/sound/mod.rs b/src/sound/mod.rs
index e4cb4e1..efdb5c2 100644
--- a/src/sound/mod.rs
+++ b/src/sound/mod.rs
@@ -83,7 +83,7 @@ impl SoundManager {
         let device = host.default_output_device().ok_or_else(|| AudioError(str!("Error initializing audio device.")))?;
         let config = device.default_output_config()?;
 
-        let bnk = wave_bank::SoundBank::load_from(filesystem::open(ctx, "/builtin/pixtone.pcm")?)?;
+        let bnk = wave_bank::SoundBank::load_from(filesystem::open(ctx, "/builtin/organya-wavetable-doukutsu.bin")?)?;
 
         std::thread::spawn(move || {
             if let Err(err) = match config.sample_format() {
@@ -197,7 +197,7 @@ fn run<T>(rx: Receiver<PlaybackMessage>, bank: SoundBank,
     org_engine.set_sample_rate(sample_rate as usize);
     org_engine.loops = usize::MAX;
 
-    let buf_size = sample_rate as usize * 30 / 1000;
+    let buf_size = sample_rate as usize * 15 / 1000;
     let mut bgm_buf = vec![0x8080; buf_size];
     let mut pxt_buf = vec![0x8000; buf_size];
     let mut bgm_index = 0;
diff --git a/src/sound/playback.rs b/src/sound/playback.rs
index 8a3e056..d9a9c8a 100644
--- a/src/sound/playback.rs
+++ b/src/sound/playback.rs
@@ -73,12 +73,13 @@ impl PlaybackEngine {
             }
         }
 
-        for (inst, buf) in song.tracks[8..].iter().zip(buffers[128..].iter_mut()) {
+        for (idx, (track, buf)) in song.tracks[8..].iter().zip(buffers[128..].iter_mut()).enumerate() {
             *buf =
                 MaybeUninit::new(
                     RenderBuffer::new(
                         // FIXME: *frustrated screaming*
-                        samples.samples[inst.inst.inst as usize].clone()
+                        //samples.samples[track.inst.inst as usize].clone()
+                        samples.samples[idx].clone()
                     )
                 );
         }