diff --git a/src/bgm.emscripten.c b/src/bgm.emscripten.c
index 44580d0..04a4dde 100644
--- a/src/bgm.emscripten.c
+++ b/src/bgm.emscripten.c
@@ -25,6 +25,7 @@
 #include "bgm.h"
 #include "audio_meta.h"
 #include "system.h"
+#include "music_private.h"
 
 bool musbgm_init(DRIFILETYPE type, int base_no) {
 	if (type == DRIFILE_BGM)
@@ -89,5 +90,5 @@ void musbgm_wait(int no, int timeout) {
 }
 
 void musbgm_reapply_valance(void) {
-	// not implemented
+	EM_ASM({ xsystem35.cdPlayer.setValance($0); }, prv.volval[BGM_VOLVAL_CH]);
 }
diff --git a/src/midi.emscripten.c b/src/midi.emscripten.c
index e100849..97fa38b 100644
--- a/src/midi.emscripten.c
+++ b/src/midi.emscripten.c
@@ -23,6 +23,7 @@
 
 #include "portab.h"
 #include "midi.h"
+#include "music_private.h"
 
 static bool midi_initialize(int subdev) {
 	return true;
@@ -82,6 +83,10 @@ EM_JS(bool, midi_fading, (void), {
 	return xsystem35.midiPlayer.isFading();
 });
 
+static void midi_reapply_valance(void) {
+	EM_ASM({ xsystem35.midiPlayer.setValance($0); }, prv.volval[BGM_VOLVAL_CH]);
+}
+
 mididevice_t midi_emscripten = {
 	.init = midi_initialize,
 	.exit = midi_exit,
@@ -95,4 +100,5 @@ mididevice_t midi_emscripten = {
 	.setflag = midi_setflag,
 	.fadestart = midi_fadestart,
 	.fading = midi_fading,
+	.reapply_volume = midi_reapply_valance,
 };
diff --git a/src/pcm.emscripten.c b/src/pcm.emscripten.c
index e63fb18..62cffec 100644
--- a/src/pcm.emscripten.c
+++ b/src/pcm.emscripten.c
@@ -23,11 +23,25 @@
 
 #include "portab.h"
 #include "music_pcm.h"
+#include "music_private.h"
+#include "nact.h"
+#include "audio_meta.h"
 
 bool muspcm_init(int audio_buffer_size) {
+	wai_load(nact->files.wai);
 	return true;
 }
 
+// Volume-valancer channel for PCM file number `no`, based on the WAI file.
+static int pcm_channel(int no) {
+	if (!wai_loaded())
+		return SE_VOLVAL_CH;
+	int ch = wai_mixch(no);
+	if ((unsigned)ch >= 16)  // guard against bad WAI data
+		ch = 0;
+	return ch;
+}
+
 void muspcm_exit(void) {
 	// do nothing
 }
@@ -36,20 +50,24 @@ EM_JS(void, muspcm_reset, (void), {
 	xsystem35.audio.pcm_reset();
 });
 
-EM_ASYNC_JS(bool, muspcm_load_no, (int slot, int no), {
-	return await xsystem35.audio.pcm_load(slot, no);
+EM_ASYNC_JS(bool, pcm_load_no_js, (int slot, int no, int ch), {
+	return await xsystem35.audio.pcm_load(slot, no, ch);
 });
 
+bool muspcm_load_no(int slot, int no) {
+	return pcm_load_no_js(slot, no, pcm_channel(no));
+}
+
 EM_ASYNC_JS(bool, muspcm_load_bgm, (int slot, int no), {
-	return await xsystem35.audio.pcm_load_bgm(slot, no);
+	return await xsystem35.audio.pcm_load_bgm(slot, no, BGM_VOLVAL_CH);
 });
 
 EM_ASYNC_JS(bool, muspcm_load_data, (int slot, uint8_t *buf, uint32_t len), {
-	return await xsystem35.audio.pcm_load_data(slot, buf, len);
+	return await xsystem35.audio.pcm_load_data(slot, buf, len, SE_VOLVAL_CH);
 });
 
 EM_ASYNC_JS(bool, muspcm_load_mixlr, (int slot, int noL, int noR), {
-	return await xsystem35.audio.pcm_load_mixlr(slot, noL, noR);
+	return await xsystem35.audio.pcm_load_mixlr(slot, noL, noR, SE_VOLVAL_CH);
 });
 
 EM_JS(void, muspcm_unload, (int slot), {
@@ -97,6 +115,10 @@ EM_ASYNC_JS(void, muspcm_waitend, (int slot), {
 	await xsystem35.audio.pcm_waitend(slot);
 });
 
+EM_JS(void, pcm_set_valance, (const int *vols, int num), {
+	xsystem35.audio.setValance(HEAP32.subarray(vols >> 2, (vols >> 2) + num));
+});
+
 void muspcm_reapply_valance(void) {
-	// not implemented
+	pcm_set_valance(prv.volval, 16);
 }