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diff --git a/Pico/Pico.h b/Pico/Pico.h
index ef2db10..0d8bcf0 100644
--- a/Pico/Pico.h
+++ b/Pico/Pico.h
@@ -42,7 +42,7 @@ int PicoReset(int hard);
 int PicoFrame(void);
 extern int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU
 extern int (*PicoCram)(int cram); // Callback to convert colour ram 0000bbb0 ggg0rrr0
-extern void (*PicoWriteSound)(void); // called once per frame at the best time to send sound buffer (PsndOut) to hardware
+extern void (*PicoWriteSound)(int len); // called once per frame at the best time to send sound buffer (PsndOut) to hardware
 
 int PicoFrameMCD(void);
 
@@ -50,12 +50,15 @@ int PicoFrameMCD(void);
 typedef size_t (arearw)(void *p, size_t _size, size_t _n, void *file);
 typedef size_t (areaeof)(void *file);
 typedef int    (areaseek)(void *file, long offset, int whence);
+typedef int    (areaclose)(void *file);
 // Save or load the state from PmovFile:
 int PmovState(int PmovAction, void *PmovFile); // &1=for reading &2=for writing &4=volatile &8=non-volatile
 extern arearw  *areaRead;  // external read and write function pointers for
 extern arearw  *areaWrite; // gzip save state ability
 extern areaeof *areaEof;
 extern areaseek *areaSeek;
+extern areaclose *areaClose;
+extern void (*PicoStateProgressCB)(const char *str);
 
 // Cart.c
 int PicoCartLoad(FILE *f,unsigned char **prom,unsigned int *psize);
@@ -89,7 +92,7 @@ extern void (*PicoPrepareCram)();    // prepares PicoCramHigh for renderer to us
 extern int PsndRate,PsndLen;
 extern short *PsndOut;
 void sound_reset();
-void sound_rerate();
+void sound_rerate(int preserve_state);
 void z80_pack(unsigned char *data);
 void z80_unpack(unsigned char *data);
 void z80_reset();