Index: /trunk/src/VBox/Devices/Audio/AudioMixBuffer.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/AudioMixBuffer.cpp	(revision 55851)
+++ /trunk/src/VBox/Devices/Audio/AudioMixBuffer.cpp	(revision 55852)
@@ -395,6 +395,7 @@
         { \
             AUDMIXBUF_MACRO_LOG(("%p: s=%RI16\n", paDst, *pSrc)); \
-            paDst->i64LSample = ASMMult2xS32RetS64((int32_t)audioMixBufClipFrom##_aName(*pSrc++), pOpts->Volume.uLeft) >> VOL_SHIFT; \
-            paDst->i64RSample = paDst->i64LSample; \
+            paDst->i64LSample = ASMMult2xS32RetS64((int32_t)audioMixBufClipFrom##_aName(*pSrc), pOpts->Volume.uLeft) >> VOL_SHIFT; \
+            paDst->i64RSample = ASMMult2xS32RetS64((int32_t)audioMixBufClipFrom##_aName(*pSrc), pOpts->Volume.uRight) >> VOL_SHIFT; \
+            ++pSrc; \
             AUDMIXBUF_MACRO_LOG(("\t-> l=%RI64, r=%RI64\n", paDst->i64LSample, paDst->i64RSample)); \
             paDst++; \