Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!CIS.OHIO-STATE.EDU!meekins From: meekins@CIS.OHIO-STATE.EDU (timothy lee meekins) Newsgroups: comp.sys.apple2 Subject: Re: GS Sound Message-ID: <9101120030.AA08926@tortoise.cis.ohio-state.edu> Date: 12 Jan 91 00:30:41 GMT References: <1991Jan11.191806.27162@en.ecn.purdue.edu> Sender: daemon@ucbvax.BERKELEY.EDU Organization: Ohio State University Computer and Information Science Lines: 51 In article <1991Jan11.191806.27162@en.ecn.purdue.edu> you write: >In article <91010.155439AABENSON@MTUS5.BITNET> writes: >>In response to Chris Wicklein: >> >>NO NO NO!! You're not understanding what I'm saying. I wasn't talking about >>"VOICES" or "GENERATORS", as Apple calls them. I was talking about the >>multiplexed channels that go to the sound expansion connector. When you >>go to play a sound, you have a choice of a VOICE, and an OUTPUT CHANNEL. >>Although the DOC itself supports 16 OUTPUT CHANNELS, the IIGS only supports >>EIGHT, and all stereo cards out right now simply pipe half the channels to >>the LEFT side, and half the channels to the RIGHT side. Remember, I am talking >>about OUTPUT channels, NOT VOICES or OSCILLATORS. >> >>Channel <> Voice <> Oscillator >> >>- Andrew. (aabenson@balance.cs.mtu.edu) > > >I'm not sure what you are talking about. If the GS only has eight output >chanels, then it would seen to me that it could only play eight different >sounds at a time. So how can I digitize fifteen different sound and play >them all back simultaneously if there are only eight output channels. > >??? You're definitely confused. The Ensoniq has 32 oscillators. In Apple's Sound Tools, they are paired together into 16 generators for higher quality sound. So that music sequencers can be used as an interrupt driver, one of these oscillators is used to generate interrupts at any defined tempo. Thus, leaving 15 sound generators. Every oscillator or generator can be outputed to a different channel. Typically sounds are sent to either a left channel or right channel. But the GS actually supports 8 separate channels. The ultimate in surround sound! Most stero cards will work with all 8 output channels, but they are split with even channels to right and odd channels to left (coorect me if I'm wrong). I hope I've cleared it up a little. A channel is totally unrelated to an oscillator. I've done quite a bit of music programming on the IIgs and feel free to ask me any other questions. -Tim Meekins -- +---------------------------S-U-P-P-O-R-T-----------------------------------+ |/ Tim Meekins <<>> Snail Mail: <<>> Apple II \| |> meekins@cis.ohio-state.edu <<>> 8372 Morris Rd. <<>> Forever! <| |\ timm@pro-tcc.cts.com <<>> Hilliard, OH 43026 <<>> /| +-------------------------S-H-A-R-E-W-A-R-E-!-------------------------------+