Re: [sc-users] trying to understand multichannel expansion

[Jonatan Liljedahl <lijon@xxxxxxxxxxxx>]

I think the ugen dump implies otherwise?

...
[ 147_*, audio, [ 146_tanh, 0.05 ] ]
[ 148_SinOsc, audio, [ 489.29419875145, 0 ] ]
[ 149_*, audio, [ 148_SinOsc, 83_MulAdd ] ]
[ 150_tanh, audio, [ 149_* ] ]
[ 151_*, audio, [ 150_tanh, 0.05 ] ]
[ 152_SinOsc, audio, [ 421.76702737808, 0 ] ]
[ 153_*, audio, [ 152_SinOsc, 83_MulAdd ] ]
[ 154_tanh, audio, [ 153_* ] ]
[ 155_*, audio, [ 154_tanh, 0.05 ] ]
[ 156_SinOsc, audio, [ 275.60228347778, 0 ] ]
[ 157_*, audio, [ 156_SinOsc, 83_MulAdd ] ]
[ 158_tanh, audio, [ 157_* ] ]
[ 159_*, audio, [ 158_tanh, 0.05 ] ]
[ 160_SinOsc, audio, [ 75.957810878754, 0 ] ]
[ 161_*, audio, [ 160_SinOsc, 83_MulAdd ] ]
[ 162_tanh, audio, [ 161_* ] ]
[ 163_*, audio, [ 162_tanh, 0.05 ] ]

For each oscillator there's one "*" ugen... Also the MulAdd ugen is the 
result of LFNoise1.ar(0.1,20,21), so it's a separate ugen and not an 
input to the lfnoise1 ugen.

Hjalte Møller wrote:
> I'm not entirely sure, but I think it's because op the optimized
> muladd arguments.
>
> As I remember
>
> SinOsc.ar(440,0,0.1) is the same as writing
> SinOsc.ar(440) * 0.1
>
> The multiplier is put inside the mul argument because it is cheaper.
>
> Best, Hjalte
>
> 2009/12/25, Jonatan Liljedahl <lijon@xxxxxxxxxxxx>:
> > First, it seems that an array inside a toplevel array does not expand
> > but is mixed instead, but I can't find any note about this in the docs
> > about multichannel expansion. example:
> >
> > {SinOsc.ar([[100,120],[105,125]],0,0.2)}.play
> >
> > The left channel is the sum of two sines with 100 and 120 hz, the right
> > 105 and 125...
> >
> > But, I have a question regarding this:
> >
> > f={({SinOsc.ar({rrand(30.0,800)}!20,0,LFNoise1.ar(0.1,20,21)).tanh}!2)*0.05}
> > SynthDef(\test,f).dumpUGens
> >
> > why is the *0.05 duplicated for each of the 40 oscillators? I was
> > expecting one for each of the two output channels.
> >
> > /Jonatan
> >
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