extern valerie_error_code miracle_unit_append( miracle_unit unit, char *clip, int32_t in, int32_t out );
extern valerie_error_code miracle_unit_remove( miracle_unit unit, int index );
extern valerie_error_code miracle_unit_clean( miracle_unit unit );
+extern valerie_error_code miracle_unit_clear( miracle_unit unit );
extern valerie_error_code miracle_unit_move( miracle_unit unit, int src, int dest );
extern int miracle_unit_transfer( miracle_unit dest_unit, miracle_unit src_unit );
extern void miracle_unit_play( miracle_unit_t *unit, int speed );