Re: [sc-dev] Some 'demand' questions

[Julian Rohrhuber <rohrhuber@xxxxxxxxxxxxxx>]

you can retrieve values without calling the same chain by writing 
them into a buffer:

demandchain = ...
b = LocalBuf(1);
demandchain = Dbufwr(demandchain, b);
// read off:
value = Dbufrd(b);
Duty.ar(0.1, 0, value);
Duty.ar(0.3, 0, demandchain);




> I often do something like this in my synths:
>
> a = play {
> 	var	initPulse = Impulse.kr(0),
> 		time = Select.kr(initPulse, [LocalIn.kr(1), 
> ExpRand(0.1, 0.25)]),
> 		trig = Impulse.kr(time.reciprocal),
> 		newTime = TExpRand.kr(0.1, 0.25, trig),
> 		freqs = TExpRand.kr(200, 900, trig ! 2),
> 		freq = EnvGen.kr(Env.new(freqs[[0, 0, 1]], [0, 1]), 
> trig, timeScale: newTime);
>
> 	LocalOut.kr(newTime);
>
> 	(SinOsc.ar(freq, 0, 0.3) * Decay2.kr(trig, 0.01, newTime * 0.7)) ! 2;
> };
>
> I need to know the time until the next trigger to get the frequency
> and decay envelopes right.
>
> With TDuty, I could get triggers appropriately timed but I don't see a
> way to get the duration values outside TDuty. This would not work with
> non-determinate demand ugens:
>
> var	demands = Dwhite(0.1, 0.5, inf),
> 	trig = TDuty.kr(demands, 0, demands);
>
> ... because 'demands' would evaluate differently in the two places.
>
> Have I overlooked a ugen that would do what I want here? Or should I
> roll up my sleeves and write a new one? If there were a TDuty variant
> that returned the duration value as the trigger's impulse, it would be
> easy to latch it and have the time.
>
> var	demands = Dwhite(0.1, 0.5, inf),
> 	trig = UnknownUGenHere.kr(demands),
> 	time = Latch.kr(trig, trig);
>
>
> Also it seems demand ugens don't work with n-ary operators, though
> binary ops are ok.
>
> This is OK:
>
> a = SynthDef(\demandMath, {
> 	var	trig = Impulse.kr(2);
> 	Demand.kr(trig, 0, Dwhite(0.0, 1.0, inf) + 2).poll(trig, "dwhite");
> }).play;
>
> This is not (always posts 200):
>
> a = SynthDef(\demandMath, {
> 	var	trig = Impulse.kr(2);
> 	Demand.kr(trig, 0, Dwhite(0.0, 1.0, inf).linexp(0.0, 1.0, 200,
> 800)).poll(trig, "dwhite");
> }).play;
>
> That is a problem for generating exponentially-distributed durations
> for TDuty (unless Dexprand has been added - I don't see it in svn).
>
> Thanks.
> hjh
>
>
> --
> James Harkins /// dewdrop world
> jamshark70@xxxxxxxxxxxxxxxxx
> http://www.dewdrop-world.net
>
> "Come said the Muse,
> Sing me a song no poet has yet chanted,
> Sing me the universal."  -- Whitman
>
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