diff --git a/libgambatte/include/gambatte.h b/libgambatte/include/gambatte.h
index 756405e..68e01b7 100644
--- a/libgambatte/include/gambatte.h
+++ b/libgambatte/include/gambatte.h
@@ -24,7 +24,6 @@
 #include "serial_io.h"
 #endif
 #include "gbint.h"
-#include "sound.h"
 #include <string>
 #include <cstddef>
 
@@ -141,7 +140,6 @@ public:
    void *rombank1_ptr() const;
    void *zeropage_ptr() const;
    void *oamram_ptr() const;
-   PSG *getPSG() const;
 #endif
 
 private:
diff --git a/libgambatte/libretro/libretro.cpp b/libgambatte/libretro/libretro.cpp
index dfc2e1a..2fdb1d6 100644
--- a/libgambatte/libretro/libretro.cpp
+++ b/libgambatte/libretro/libretro.cpp
@@ -1144,17 +1144,6 @@ static void check_variables(void)
 
    /* Interframe blending option has its own handler */
    check_frame_blend_variable();
-   
-   char sound_channel_volume_base_str[] = "gambatte_channel_1_volume";
-   var.key = sound_channel_volume_base_str;
-   for (unsigned c = 0; c < 4; c++) {
-       sound_channel_volume_base_str[17] = c+'1';
-       if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
-       {
-           gb.getPSG()->setSoChanVolume(unsigned(atoi(var.value)), c);
-       }
-   }
-   
 
 #ifdef HAVE_NETWORK
 
diff --git a/libgambatte/libretro/libretro_core_options.h b/libgambatte/libretro/libretro_core_options.h
index d174678..6942e0e 100644
--- a/libgambatte/libretro/libretro_core_options.h
+++ b/libgambatte/libretro/libretro_core_options.h
@@ -322,86 +322,6 @@ struct retro_core_option_definition option_defs_us[] = {
       },
       "10"
    },
-   {
-      "gambatte_channel_1_volume",
-      "Square 1 Channel volume %",
-      "Modify Square 1 Volume  %.",
-      {
-         { "0",   NULL },
-         { "10",   NULL },
-         { "20",   NULL },
-         { "30",   NULL },
-         { "40",   NULL },
-         { "50",   NULL },
-         { "60",   NULL },
-         { "70",   NULL },
-         { "80",   NULL },
-         { "90",   NULL },
-         { "100",  NULL },
-         { NULL, NULL },
-      },
-      "100"
-   },
-   {
-      "gambatte_channel_2_volume",
-      "Square 2 Channel volume %",
-      "Modify Square 2 Volume %.",
-      {
-         { "0",   NULL },
-         { "10",   NULL },
-         { "20",   NULL },
-         { "30",   NULL },
-         { "40",   NULL },
-         { "50",   NULL },
-         { "60",   NULL },
-         { "70",   NULL },
-         { "80",   NULL },
-         { "90",   NULL },
-         { "100",  NULL },
-         { NULL, NULL },
-      },
-      "100"
-   },
-   {
-      "gambatte_channel_3_volume",
-      "Wave Channel volume %",
-      "Modify Wave Volume %.",
-      {
-         { "0",   NULL },
-         { "10",   NULL },
-         { "20",   NULL },
-         { "30",   NULL },
-         { "40",   NULL },
-         { "50",   NULL },
-         { "60",   NULL },
-         { "70",   NULL },
-         { "80",   NULL },
-         { "90",   NULL },
-         { "100",  NULL },
-         { NULL, NULL },
-      },
-      "100"
-   },
-   {
-      "gambatte_channel_4_volume",
-      "Noise Channel volume %",
-      "Modify Noise Volume %.",
-      {
-         { "0",   NULL },
-         { "10",   NULL },
-         { "20",   NULL },
-         { "30",   NULL },
-         { "40",   NULL },
-         { "50",   NULL },
-         { "60",   NULL },
-         { "70",   NULL },
-         { "80",   NULL },
-         { "90",   NULL },
-         { "100",  NULL },
-         { NULL, NULL },
-      },
-      "100"
-   },
 #ifdef HAVE_NETWORK
    {
       "gambatte_show_gb_link_settings",
diff --git a/libgambatte/src/gambatte-memory.h b/libgambatte/src/gambatte-memory.h
index d47f0e1..c2d8868 100644
--- a/libgambatte/src/gambatte-memory.h
+++ b/libgambatte/src/gambatte-memory.h
@@ -62,7 +62,6 @@ public:
    void *rombank1_ptr() const { return cart_.romdata(0) + 0x4000; }
    void *zeropage_ptr() const { return (void*)(ioamhram_ + 0x0180); }
    void *oamram_ptr() const { return (void*)ioamhram_; }
-   PSG *psg_ptr() const { return (PSG*)&psg_; }
 #else
    void loadSavedata() { cart_.loadSavedata(); }
    void saveSavedata() { cart_.saveSavedata(); }
diff --git a/libgambatte/src/gambatte.cpp b/libgambatte/src/gambatte.cpp
index 3ac5bf6..8208b5f 100644
--- a/libgambatte/src/gambatte.cpp
+++ b/libgambatte/src/gambatte.cpp
@@ -219,10 +219,6 @@ void *GB::zeropage_ptr() const {
 void *GB::oamram_ptr() const {
  return p_->cpu.oamram_ptr();
 }
-
-PSG *GB::getPSG() const {
-  return p_->cpu.mem_.psg_ptr();
-}
 #endif
 
 }
diff --git a/libgambatte/src/sound.cpp b/libgambatte/src/sound.cpp
index 1b0f3a0..5533e6f 100644
--- a/libgambatte/src/sound.cpp
+++ b/libgambatte/src/sound.cpp
@@ -51,11 +51,6 @@ namespace gambatte
       ,  rsum_(0x8000) // initialize to 0x8000 to prevent borrows from high word, xor away later
       ,  enabled_(false)
    {
-       // init as full volume
-       setSoChanVolume(100, 0);
-       setSoChanVolume(100, 1);
-       setSoChanVolume(100, 2);
-       setSoChanVolume(100, 3);
    }
 
    void PSG::init(const bool cgb)
@@ -103,10 +98,10 @@ namespace gambatte
       uint_least32_t *const buf = buffer_ + bufferPos_;
 
       std::memset(buf, 0, cycles * sizeof(uint_least32_t));
-      ch1_.update(buf, (soChVol_[0] * soVol_ * 0x1999999A) >> 32, cycles);
-      ch2_.update(buf, (soChVol_[1] * soVol_ * 0x1999999A) >> 32, cycles);
-      ch3_.update(buf, (soChVol_[2] * soVol_ * 0x1999999A) >> 32, cycles);
-      ch4_.update(buf, (soChVol_[3] * soVol_ * 0x1999999A) >> 32, cycles);
+      ch1_.update(buf, soVol_, cycles);
+      ch2_.update(buf, soVol_, cycles);
+      ch3_.update(buf, soVol_, cycles);
+      ch4_.update(buf, soVol_, cycles);
    }
 
    void PSG::generateSamples(unsigned long const cycleCounter, bool const doubleSpeed)
@@ -185,14 +180,6 @@ namespace gambatte
       soVol_ = (((nr50      & 0x7) + 1) * so1Mul 
             +  ((nr50 >> 4 & 0x7) + 1) * so2Mul) * 64;
    }
-   
-   void PSG::setSoChanVolume(const unsigned percent, const unsigned ch)
-   {
-      if( ch > 3 || percent > 100 )
-        return; // invalid arg
-        
-      soChVol_[ch] = int(percent / 10);
-   }
 
    void PSG::mapSo(const unsigned nr51)
    {
diff --git a/libgambatte/src/sound.h b/libgambatte/src/sound.h
index 0c22b55..5e8d15b 100644
--- a/libgambatte/src/sound.h
+++ b/libgambatte/src/sound.h
@@ -71,7 +71,6 @@ public:
 	void setNr44(unsigned data) { ch4_.setNr4(data); }
 
 	void setSoVolume(unsigned nr50);
-	void setSoChanVolume(unsigned percent, unsigned ch);
 	void mapSo(unsigned nr51);
 	unsigned getStatus() const;
 
@@ -84,7 +83,6 @@ private:
 	std::size_t bufferPos_;
 	unsigned long lastUpdate_;
 	unsigned long soVol_;
-	unsigned long soChVol_[4];
 	uint_least32_t rsum_;
 	bool enabled_;