C64: fix reSIDfp envelope reset being inconsistent

src/engine/platform/c64.cpp

@@ -21,6 +21,7 @@
 #include "../engine.h"
 #include "sound/c64_fp/siddefs-fp.h"
 #include <math.h>
+#include "../../ta-log.h"
 
 #define rWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
 
@@ -525,6 +526,7 @@ void DivPlatformC64::reset() {
 
   if (isFP) {
     sid_fp.reset();
+    sid_fp.clockSilent(16000);
   } else {
     sid.reset();
   }

src/engine/platform/sound/c64_fp/EnvelopeGenerator.cpp

@@ -61,7 +61,6 @@ const unsigned int EnvelopeGenerator::adsrtable[16] =
 
 void EnvelopeGenerator::reset()
 {
-    // counter is not changed on reset
     envelope_pipeline = 0;
 
     state_pipeline = 0;
@@ -73,7 +72,7 @@ void EnvelopeGenerator::reset()
 
     gate = false;
 
-    resetLfsr = true;
+    resetLfsr = false;
 
     exponential_counter = 0;
     exponential_counter_period = 1;
@@ -81,7 +80,11 @@ void EnvelopeGenerator::reset()
 
     state = RELEASE;
     counter_enabled = true;
-    rate = adsrtable[release];
+    rate = 0;
+
+    envelope_counter = 0;
+    env3 = 0;
+    lfsr = 0x7fff;
 }
 
 void EnvelopeGenerator::writeCONTROL_REG(unsigned char control)

src/engine/platform/sound/c64_fp/EnvelopeGenerator.h

@@ -146,7 +146,7 @@ public:
         counter_enabled(true),
         gate(false),
         resetLfsr(false),
-        envelope_counter(0xaa),
+        envelope_counter(0),
         attack(0),
         decay(0),
         sustain(0),