- [FIX] el só para durant el debug [però new BUG: al tornar està desincronitzat]

- [FIX] si el canal està desactivat, no fer el envelope sweep
- [FIX] Se miraba el bit incorrecte per a determinar si el envelope sweep anava amunt o avall

APU.cpp

@@ -79,11 +79,21 @@ namespace APU
         }
     }
 
-   void init()
+    void silence()
+    {
+        SDL_PauseAudioDevice(sdlAudioDevice, 1);
+    }
+
+    void resume()
+    {
+        SDL_PauseAudioDevice(sdlAudioDevice, 0);
+    }
+
+    void init()
     {
         SDL_AudioSpec audioSpec{11025, AUDIO_U8, 1, 0, AUDIO_BUFFER_SIZE>>2, 0, 0, &audioCallback, NULL};
         sdlAudioDevice = SDL_OpenAudioDevice(NULL, 0, &audioSpec, NULL, 0);
-        SDL_PauseAudioDevice(sdlAudioDevice, 0);
+        resume();
         //samples_time=SDL_GetTicks();
     }
 
@@ -183,11 +193,11 @@ namespace APU
         DIVAPU_envelope_sweep++;
         if (DIVAPU_envelope_sweep==8) {
             DIVAPU_envelope_sweep=0;
-            if ( NR12&0x7 ) {   // If sweep pace != 0, envelope sweep is enabled
+            if ( CH1.enabled && (NR12&0x7) ) {   // If sweep pace != 0, envelope sweep is enabled
                 CH1.envelope_sweep_timer++;
                 if ( CH1.envelope_sweep_timer == (NR12&0x07) ) {    // if timer == envelope sweep, increase or decrease volume
                     CH1.envelope_sweep_timer=0;
-                    if (NR12&0x80) {    // bit set increases, reset decreases
+                    if (NR12&0x8) {    // bit set increases, reset decreases
                         if (CH1.volume<0x0f) CH1.volume++;
                     } else {
                         if (CH1.volume>0) CH1.volume--;