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- Newsgroups: alt.sys.amiga.demos,comp.sys.amiga.audio
- Path: sparky!uunet!mcsun!sunic!corax.udac.uu.se!tdb!m92mmy
- From: m92mmy@tdb.uu.se (Mattias Myrberg)
- Subject: Re: Criti!
- Message-ID: <1992Dec14.174633.25907@tdb.uu.se>
- Organization: Dept. of Scientific Computing, Uppsala Univ.
- X-Newsreader: TIN [version 1.1 PL6]
- References: <doug.04ou@dsij.uucp>
- Date: Mon, 14 Dec 1992 17:46:33 GMT
- Lines: 31
-
- In article 4722 Doug Johnson writes:
-
- >>I know you can use one channel to modulate the frequencey or amplitude
- >>of another channel, but how does this work ? (I mean, do you automagically
- >>get a sinewave modulation out of no where ?)
-
- >There are separate bits that cause a channel to modulate the next higher
- >channel. Channel 0 can't be modulated. The modulating channel's data should
- >point to word size period samples if the period mod bit is set.
- >If the period and amplitude bits are set, the data should point to alternating
- >words of amplitude/period data (0=>64 / 124=>2^16-1).
- >I'm not sure whether AM only data is word or byte data.
- >From adkbits.i, it looks like the lowest eight bits of ADKCON, or
- >something :). Bits 0 to 2 set the corresponding channel to modulate the next
- >channel's volume. Bits 4 to 6 set the period mod bits for channels 0 to 2.
-
- How strange, I thought it was channel 3 that could not be modulated,
- you know 1 modulates 0, 2 modulates 1, and 3 modulates 2...hence channel 3
- cannot be modulated...
-
- Right ?
-
- Anyway, thanks for the info ! :)
-
- /Mattias
-
- ________
- Mattias Myrberg
-
- m92mmy@bellatrix.tdb.uu.se
-
-