diff --git a/src/engine/platform/mmc5.cpp b/src/engine/platform/mmc5.cpp
index 66bead9da..8446643b6 100644
--- a/src/engine/platform/mmc5.cpp
+++ b/src/engine/platform/mmc5.cpp
@@ -304,6 +304,7 @@ int DivPlatformMMC5::dispatch(DivCommand c) {
     }
     case DIV_CMD_STD_NOISE_MODE:
       chan[c.chan].duty=c.value;
+      rWrite(0x5000+c.chan*4,0x30|chan[c.chan].outVol|((chan[c.chan].duty&3)<<6));
       break;
     case DIV_CMD_SAMPLE_BANK:
       sampleBank=c.value;
diff --git a/src/engine/platform/nes.cpp b/src/engine/platform/nes.cpp
index dffcb7ee1..4b301839d 100644
--- a/src/engine/platform/nes.cpp
+++ b/src/engine/platform/nes.cpp
@@ -520,6 +520,8 @@ int DivPlatformNES::dispatch(DivCommand c) {
       chan[c.chan].duty=c.value;
       if (c.chan==3) { // noise
         chan[c.chan].freqChanged=true;
+      } else if (c.chan<2) {
+        rWrite(0x4000+c.chan*4,0x30|chan[c.chan].outVol|((chan[c.chan].duty&3)<<6));
       }
       break;
     case DIV_CMD_NES_SWEEP: