[sc-users] Sending Data from a SynthDef on a control bus. (beginner problem)

[Patrick Morgan <pjbm20@xxxxxxxxxxxx>]

Hello All,

I'm trying to write something into my synth def code that will send values
out on a control bus, so that I can use them on the language side.

I'm probably going about this the wrong way but if I try setting up the bus
in the synth def, I get an error:

(
SynthDef("simpleComb",{arg filtF=300,delayTime=0.3,s=Server.default;
    var in, out,out2,out3,bus,amp;
    in=Mix.new(SoundIn.ar([0,1]));
    out=CombN.ar(in,delayTime,10,5);
    out2=CombN.ar(in,delayTime+(delayTime/2),10,5);
    out3=CombN.ar(in,delayTime+(delayTime/3),10,5);
    bus=Bus.control(s,1);
    amp=Amplitude.kr(out3);
    Out.ar(0,Pan2.ar(RLPF.ar(out+out2+out3,filtF,0.5),0));
}).load(s);
)

However if I leave the bus out of the SynthDef, try to set it up after and
map the value to it, obviously I don't have access to the variable:

(
SynthDef("simpleComb",{arg filtF=300,delayTime=0.3,s=Server.default;
    var in, out,out2,out3,amp;
    in=Mix.new(SoundIn.ar([0,1]));
    out=CombN.ar(in,delayTime,10,5);
    out2=CombN.ar(in,delayTime+(delayTime/2),10,5);
    out3=CombN.ar(in,delayTime+(delayTime/3),10,5);
    amp=Amplitude.kr(out3);
    Out.ar(0,Pan2.ar(RLPF.ar(out+out2+out3,filtF,0.5),0));
}).load(s);
)

Synth(\simpleComb);

b=Bus.control(s);

amp.map(1,b); // - obviously won't work.

What is the best approach for what I'm attempting here? All the examples and
help seem to either use control busses for sending values to a synth def or
use them without synth defs and just {}.play notation. I would use shared
busses but (am I right in thinking?) I can't use the internal server with
external soundcard. I know SendTrig.kr and an OSC responder is an option but
I'm already using several OSC responders to listen to others via a network
so I'm keen to keep them out of my "local" code if possible.

Thanks,
Pat



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