info-mac@uw-beaver (info-mac) (09/22/84)
From: Gustavo Fernandez <FERNANDEZ@SU-SCORE.ARPA> Has anyone tried to use the free form music output on the MAC? I put one note per buffer, but I get annoying clicks before and after each write (i.e. between notes.) Any ideas? -------
info-mac@uw-beaver (info-mac) (09/26/84)
From: mark@harvard.ARPA (Mark Lentczner) -=- You will get clicks if the last sample in the preceding note is significantly different that the first sample in the following note. I havn't tried this yet, but I suspect that if the two samples are the same, you'll not hear a click. Try forcing all you notes to start and end with the same sample value. -mark
info-mac@uw-beaver (info-mac) (09/26/84)
From: Gustavo Fernandez <FERNANDEZ@SU-SCORE.ARPA> My problem is not with discontinuities across notes but with the sound driver stoping and restarting between assynchronous I/O calls. My envelop makes sure that both beginning and ending are at $80 (00 on a unipolar DAC like on the MAC) Is there a way to switch buffers on the fly using the ROM sound driver in free-form mode Has Anyone tried to drive the sound buffer directly? My main question is how to write the interupt service routine so that the soound buffer is neither over-run or under-run. Gus Fernandez FERNANDEZ@SU-SCORE -------