diff --git a/.gitmodules b/.gitmodules
index 53673b4b..a893b7a8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -6,4 +6,4 @@
 	url = https://github.com/HarbourMasters/Torch
 [submodule "libultraship"]
 	path = libultraship
-	url = https://github.com/dcampora/libultraship.git
+	url = https://github.com/Kenix3/libultraship.git
diff --git a/src/audio/audio_playback.c b/src/audio/audio_playback.c
index b1c75dca..03d4b639 100644
--- a/src/audio/audio_playback.c
+++ b/src/audio/audio_playback.c
@@ -140,11 +140,8 @@ void Audio_InitNoteSub(Note* note, NoteAttributes* noteAttr) {
         }
     } else {
         // Surround 5.1
-        const float vol_voice = 0.8f;
-        const float vol_music = 0.707f;
-        
         if (stereo.s.is_voice) { // VOICE
-            panVolumeCenter = vol_voice;
+            panVolumeCenter = 1.0f;
         }
         else if (stereo.s.is_sfx) { // SFX
             float pan_angle = (float)(pan + 64) / 128 * 2 * M_PI;
@@ -164,13 +161,11 @@ void Audio_InitNoteSub(Note* note, NoteAttributes* noteAttr) {
             panVolumeRight = fmaxf(0, cosf(pan_angle - front_right)); // Front Right
             panVolumeRearLeft = fmaxf(0, cosf(pan_angle - rear_left));   // Rear Left
             panVolumeRearRight = fmaxf(0, cosf(pan_angle - rear_right));  // Rear Right
-
-            // printf("pan: %d, pan_angle: %f, left: %f, right: %f, rleft: %f, rright: %f\n", pan, pan_angle, panVolumeLeft, panVolumeRight, panVolumeRearLeft, panVolumeRearRight);
         } else { // MUSIC
-            panVolumeLeft = vol_music;
-            panVolumeRight = vol_music;
-            panVolumeRearLeft = vol_music;
-            panVolumeRearRight = vol_music;
+            panVolumeLeft = gStereoPanVolume[pan];
+            panVolumeRight = gStereoPanVolume[ARRAY_COUNT(gStereoPanVolume) - 1 - pan];
+            panVolumeRearLeft = gStereoPanVolume[pan];
+            panVolumeRearRight = gStereoPanVolume[ARRAY_COUNT(gStereoPanVolume) - 1 - pan];
         }
     }
 
diff --git a/src/audio/audio_synthesis.c b/src/audio/audio_synthesis.c
index 5ad68b49..1558adfc 100644
--- a/src/audio/audio_synthesis.c
+++ b/src/audio/audio_synthesis.c
@@ -727,6 +727,11 @@ Acmd* AudioSynth_LoadReverbSamples(Acmd* aList, s32 aiBufLen, s16 reverbIndex, s
     s16 sp62;
     s16 sp60;
 
+    u16 left_channel = DMEM_LEFT_CH;
+    if (GetNumAudioChannels() == 6) {
+        left_channel = DMEM_REAR_LEFT_CH;
+    }
+
     aClearBuffer(aList++, DMEM_WET_LEFT_CH, DMEM_2CH_SIZE);
 
     if (gSynthReverbs[reverbIndex].downsampleRate == 1) {
@@ -735,7 +740,7 @@ Acmd* AudioSynth_LoadReverbSamples(Acmd* aList, s32 aiBufLen, s16 reverbIndex, s
             aList =
                 AudioSynth_LoadRingBufferPart(aList, sp64->lengthA + DMEM_WET_LEFT_CH, 0, sp64->lengthB, reverbIndex);
         }
-        aAddMixer(aList++, DMEM_2CH_SIZE, DMEM_WET_LEFT_CH, DMEM_LEFT_CH);
+        aAddMixer(aList++, DMEM_2CH_SIZE, DMEM_WET_LEFT_CH, left_channel);
         aMix(aList++, 0x30, gSynthReverbs[reverbIndex].decayRatio + 0x8000, DMEM_WET_LEFT_CH, DMEM_WET_LEFT_CH);
     } else {
         sp62 = (sp64->startPos & 7) * 2;
@@ -751,7 +756,7 @@ Acmd* AudioSynth_LoadReverbSamples(Acmd* aList, s32 aiBufLen, s16 reverbIndex, s
         aSetBuffer(aList++, 0, sp62 + DMEM_UNCOMPRESSED_NOTE, DMEM_WET_RIGHT_CH, aiBufLen * 2);
         aResample(aList++, gSynthReverbs[reverbIndex].resampleFlags, gSynthReverbs[reverbIndex].unk_0A,
                   OS_K0_TO_PHYSICAL(gSynthReverbs[reverbIndex].unk_34));
-        aAddMixer(aList++, DMEM_2CH_SIZE, DMEM_WET_LEFT_CH, DMEM_LEFT_CH);
+        aAddMixer(aList++, DMEM_2CH_SIZE, DMEM_WET_LEFT_CH, left_channel);
         aMix(aList++, 0x30, gSynthReverbs[reverbIndex].decayRatio + 0x8000, DMEM_WET_LEFT_CH, DMEM_WET_LEFT_CH);
     }
 
diff --git a/src/audio/mixer.c b/src/audio/mixer.c
index a2b1798b..c2f9f3ea 100644
--- a/src/audio/mixer.c
+++ b/src/audio/mixer.c
@@ -710,9 +710,10 @@ void aEnvMixerImpl(uint16_t in_addr, uint16_t n_samples, bool swap_reverb,
                     *dry[j] = clamp16(*dry[j] + samples[j]);
                     dry[j]++;
 
-                    if (j >= 4) {
-                        // Apply reverb only to the rear channels (4 and 5)
-                        *wet[j] = clamp16(*wet[j] + (samples[swapped[j % 2]] * vol_wet >> 16));
+                    if (j < 2) {
+                        // Apply reverb only to the front stereo channels wet
+                        // They will be mixed with the rear channels later
+                        *wet[j] = clamp16(*wet[j] + (samples[swapped[j]] * vol_wet >> 16));
                         wet[j]++;
                     }
                 }