diff --git a/configure.py b/configure.py
index 03855f0a..1ea462d8 100755
--- a/configure.py
+++ b/configure.py
@@ -1172,11 +1172,11 @@ config.libs = [
         ],
     },
     MusyX(
-        # debug=True,
-        # mw_version="GC/1.2.5",
-        # major=2,
-        # minor=0,
-        # patch=0,
+        debug=True,
+        mw_version="GC/1.2.5",
+        major=1,
+        minor=5,
+        patch=3,
         objects=[
             Object(Matching, "musyx/runtime/seq.c"),
             Object(Matching, "musyx/runtime/synth.c"),
diff --git a/include/musyx/musyx_priv.h b/include/musyx/musyx_priv.h
index a0120de8..a42c930c 100644
--- a/include/musyx/musyx_priv.h
+++ b/include/musyx/musyx_priv.h
@@ -513,7 +513,7 @@ typedef struct SYNTH_VOICE {
   u32 id;                                 // offset 0xF4, size 0x4
   VID_LIST* vidList;                      // offset 0xF8, size 0x4
   VID_LIST* vidMasterList;                // offset 0xFC, size 0x4
-#if MUSY_VERSION > MUSY_VERSION_CHECK(1, 5, 3) && MUSY_VERSION <= MUSY_VERSION_CHECK(2, 0, 0)
+#if MUSY_VERSION >= MUSY_VERSION_CHECK(1, 5, 0) && MUSY_VERSION <= MUSY_VERSION_CHECK(2, 0, 0)
   u16 allocId; // offset 0x100, size 0x2
 #else
   u32 allocId;
diff --git a/src/musyx/runtime/synth_adsr.c b/src/musyx/runtime/synth_adsr.c
index 629d7f26..bc2f7001 100644
--- a/src/musyx/runtime/synth_adsr.c
+++ b/src/musyx/runtime/synth_adsr.c
@@ -13,9 +13,14 @@ static u32 adsrGetIndex(ADSR_VARS* adsr) {
 
 u32 adsrConvertTimeCents(long tc) { return 1000.f * powf(2.f, 1.2715658e-08f * tc); }
 
+#pragma dont_inline on
 u32 salChangeADSRState(ADSR_VARS* adsr) {
   u32 VoiceDone; // r30
+  VoiceDone = FALSE;
+
+  return VoiceDone;
 }
+#pragma dont_inline reset
 
 u32 adsrSetup(ADSR_VARS* adsr) {
   adsr->state = 0;
@@ -68,6 +73,57 @@ u32 adsrHandle(ADSR_VARS* adsr, u16* adsr_start, u16* adsr_delta) {
   s32 old_volume; // r29
   bool VoiceDone; // r28
   s32 vDelta;     // r27
+
+  VoiceDone = FALSE;
+
+  switch (adsr->mode) {
+  case 0:
+    if (adsr->state != 3) {
+      old_volume = adsr->currentVolume;
+      adsr->currentVolume += adsr->currentDelta;
+      *adsr_start = old_volume >> 16;
+      if (adsr->currentDelta >= 0) {
+        *adsr_delta = adsr->currentDelta >> 21;
+      } else {
+        *adsr_delta = -(-adsr->currentDelta >> 21);
+      }
+
+      if (--adsr->cnt == 0) {
+        VoiceDone = salChangeADSRState(adsr);
+      }
+    } else {
+      *adsr_start = adsr->currentVolume >> 16;
+      *adsr_delta = 0;
+    }
+    break;
+  case 1:
+    if (adsr->state != 3) {
+      old_volume = adsr->currentVolume;
+      if (adsr->data.dls.aMode == 0 && adsr->state == 1) {
+        adsr->currentVolume += adsr->currentDelta;
+      } else {
+        adsr->currentIndex += adsr->currentDelta;
+        adsr->currentVolume = dspAttenuationTab[adsrGetIndex(adsr)] << 16;
+      }
+      *adsr_start = old_volume >> 16;
+      vDelta = adsr->currentVolume - old_volume;
+      if (vDelta >= 0) {
+        *adsr_delta = vDelta >> 21;
+      } else {
+        *adsr_delta = -(-vDelta >> 21);
+      }
+
+      if (--adsr->cnt == 0) {
+        VoiceDone = salChangeADSRState(adsr);
+      }
+    } else {
+      *adsr_start = adsr->currentVolume >> 16;
+      *adsr_delta = 0;
+    }
+    break;
+  }
+
+  return VoiceDone;
 }
 u32 adsrHandleLowPrecision(ADSR_VARS* adsr, u16* adsr_start, u16* adsr_delta) {
   u8 i; // r31