diff --git a/src/Cafe/OS/libs/snd_core/ax_voice.cpp b/src/Cafe/OS/libs/snd_core/ax_voice.cpp
index d4e562e0..0b2f881d 100644
--- a/src/Cafe/OS/libs/snd_core/ax_voice.cpp
+++ b/src/Cafe/OS/libs/snd_core/ax_voice.cpp
@@ -573,7 +573,7 @@ namespace snd_core
 		{
 			channelCount = AX_DRC_CHANNEL_COUNT;
 			voiceMix = internal->deviceMixDRC + deviceIndex * 16;
-			deviceMixMask = internal->deviceMixMaskDRC;
+			deviceMixMask = internal->deviceMixMaskDRC + deviceIndex * AX_BUS_COUNT;
 		}
 		else if (device == AX_DEV_RMT)
 		{