Re: [sc-dev] USing the same buffer for multiple pv's

[James McCartney <asynth@xxxxxx>]

On Thursday, December 12, 2002, at 12:17 PM, Casey Basichis wrote:
> Is it possible to use the same buffer for multiple
> pv's if they are in series, or do i need different
> buffers for each synth?

You are not supposed to specify a buffer for the PV ugens. Only the FFT 
is supposed to have the buffer specified. The PV ugens pass a trigger 
among themselves that contains the buffer only on the sample when they 
are to do their calculation. That is what the variable 'chain' is 
below. Passing the chain variable does three things: enforces the 
execution order, specifies the buffer to operate on, triggers the 
operation at the right time.

The FFT generates the 'chain' signal and it is passed along from each 
ugen to the next in the order you want the operations done.

(
x = SynthDef("randcomb", { arg bufnum=0;
	var in, chain;
	in = {WhiteNoise.ar(0.8)}.dup;
	chain = FFT(bufnum, in);
	chain = PV_RandComb(chain, 0.95, Impulse.kr(0.4));
	Out.ar(0, IFFT(chain));
}).writeDefFile;
s.sendMsg("/d_load", "synthdefs/randcomb.scsyndef");
)


--
--- james mccartney   james@xxxxxxxxxxxxxx   <http://www.audiosynth.com>
SuperCollider - a real time synthesis programming language for the 
PowerMac.
<ftp://www.audiosynth.com/pub/updates/SC2.2.16.sea.hqx>