diff --git a/agb/src/sound/mixer/sw_mixer.rs b/agb/src/sound/mixer/sw_mixer.rs
index 96b7dc1..d423c64 100644
--- a/agb/src/sound/mixer/sw_mixer.rs
+++ b/agb/src/sound/mixer/sw_mixer.rs
@@ -118,7 +118,7 @@ impl MixerBuffer {
             }
 
             let right_amount = ((channel.panning + 1) / 2) * channel.volume;
-            let left_amount = (-right_amount + 1) * channel.volume;
+            let left_amount = ((-channel.panning + 1) / 2) * channel.volume;
 
             if channel.pos + channel.playback_speed * SOUND_BUFFER_SIZE >= channel.data.len().into()
             {