FDCREG_TRACK
track = FDC_READ( FDCREG_TRACK);
FDC_WRITE( FDCREG_TRACK, track >> SUDT->stretch);
track = FDC_READ( FDCREG_TRACK);
FDC_WRITE( FDCREG_TRACK, track << SUDT->stretch);
track = FDC_READ( FDCREG_TRACK);
FDC_WRITE(FDCREG_TRACK,track >> SUDT->stretch);
FDC_WRITE (FDCREG_TRACK, 0xff00);
FDC_WRITE( FDCREG_TRACK, UD.track );