Am 13.04.2016 um 09:23 schrieb Simon Staudenmayer:
> Hello Faust-Team,
>
> I have a problem getting a simple source selector to work.
> The faust code is the following:
>
> switcher(channels,1) =_ , par(i, channels-1,!);
> switcher(channels, channels) = par(i, channels-1,!),_;
> switcher(channels, pos)=par(i, pos-1, !), _ , par(i, channels-pos, !);
>
> srces = 3;
> position = 2
>
> process= par(i,srces_): switcher(srces,position);
>
> This works, however, if I want to control the position with a slider,
> e.g. like
>
> process = ...switcher(srces, sel_osci);
>
> it fails with "the node of the tree is not an int nor a float": I
> tried already the following things, but all were unsuccessful:
>
> sel_osci = 1:*(hslider("oscisrc [style:knob]", 1 , 1, 3 , 1));
> sel_osci = 1:*(hslider("oscisrc [style:knob]", 1 , 1, 3 , 1)): int;
> sel_osci = 1:*(hslider("oscisrc [style:knob]", 1 , 1, 3 , 1)): int;
> sel_osci = int(hslider("oscisrc [style:knob]", 1 , 1, 3 , 1)));
>
>
> Another method, though no ideal (because of the merging :>), I tried was
>
> switch(k, srces) = *(k == pos);
> switcher(srces, position) = par(i, srces, _) : par(i, srces, switch(i,
> position)):>_;
>
> This worked, but I got weird some audio artefacts (sometimes two
> oscillators could be heard at once or the knob was very sensitive to
> slight movements, and e.g. no giving me the first src at exactly
> position 1 but at a small "off-1"-position).
> Is there a simple way to get the first example to work or an easy
> alternative?
>
> Thanks in advance!
>
> Simon
here is how I've implemented a source switcher for 4 channels (first
channel is a simple pass):
import("music.lib");
import("math.lib");
ch1 = *(0.5);
ch2 = *(1.5);
ch3 = *(2.0);
sel(n) = environment {
a = min(2, max(0,n));
b = min(2, max(0,n-1));
c = min(2, max(0,n-2));
};
selfilter(n) = _<: a <: b <: c :>_ with {
a = select3(sel(n).a,_,ch1,_);
b = select3(sel(n).b,_,ch2,_);
c = select3(sel(n).c,_,ch3,_);
};
sl = hslider("select channel",0,0,3,1);
process = selfilter(sl);
regards
hermann
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