extern tslot *pe_slot;
extern tslot *pe_copy_buffer;
extern unsigned char pe_pattern_no;
extern unsigned char pe_note_no;
extern unsigned char pe_octave_no;
extern unsigned char pe_chan_real;
extern unsigned char pe_pos_real;
extern unsigned char pe_chan_hl;
extern unsigned char pe_pos_hl;
extern unsigned char pe_chan_hl_old;
extern unsigned char pe_pos_hl_old;
extern unsigned char pe_nodischans;
extern unsigned char pe_mchan_begin;
extern unsigned char pe_mchan_end;
extern unsigned char pe_mpos_begin;
extern unsigned char pe_mpos_end;
extern unsigned char pe_mflag;
extern unsigned char pe_copied_flag;

extern void play_slot(int note_value);
extern void display_oct_no(void);
extern void dec_oct_no(void);
extern void inc_oct_no(void);
extern int mus_kb_input(void);
extern void pe_dis_seqpat_no_bg(void);
extern void pe_display_trak(
  unsigned char pat_no,
  unsigned char chan_real,
  unsigned char pos_real);
extern void pe_display_ind(unsigned char pat_no,unsigned char pos_real);
extern void pe_display_bg(void);
extern void pe_display_all(void);
extern void pe_main(void);