Problem with mapping audio-rate Controls

Questions
1

Hey there,

I am having trouble with mapping audio-rate controls in Synths (and NodeProxies) to audio Busses. This mysteriously doesn’t work:

i = { Out.ar(128, SinOsc.ar(0.2)) }.play; 
u = { \test.ar.poll; 0 }.play(addAction: 'addToTail'); 
u.map(\test, 128);

// doesn't work either
s.sendMsg("/n_map", u.nodeID, \test, 128);

Just for comparison: The control-rate equivalent works:

i = { Out.kr(128, SinOsc.kr(0.2)) }.play; 
u = { \test.kr.poll; 0 }.play(addAction: 'addToTail'); 
u.map(\test, 128);

Do you know what i could be doing wrong?
I’m on SuperCollider 3.11.2 on Mac OS 10.14.

All the best,
moritz

2

try

u.set(\test,\a128)

when mapping an audio rate control you need to use the .asMap method

a=Bus.audio;
{SinOsc.ar(1).range(100,100)}.play(s,a.index);
b={Saw.ar(\freq.ar(300),0.1}.play;
b.set(\freq,a.asMap)

asMap just returns a symbol prepending the rate (a in this case) to the bus index number.
so in your case you can simply use \a128

3

On the other hand this works for me

a={Saw.ar(\freq.ar(300),0.1)}.play;
b=Bus.audio;
{SinOsc.ar(1).range(100,110)}.play(s,b.index);
a.map(\freq,b);

so maybe I’m mistaken!

Are you sure 128 was an audio bus?

4

The problem is that map doesn’t know whether 128 refers to a control or audio bus, so it just assumes a control bus. If you pass a Bus object instead of a number, it should work. This is mentioned in the documentation of Node.map:

Integer bus indices are assumed to refer to control buses. To map a control to an audio bus, you must use a Bus object.

1 Like
5

ahhhh, I had overlooked that… thank you so much!

6

hey,
I somehow still get in to trouble when I try to map NodeProxy inputs:

Ndef(\k, { K2A.ar([1, 2, 3, 4]) }); 
Ndef(\x, { \test.ar.poll; 0 });

Ndef(\x).set(\test, Bus(index: (Ndef(\k).bus.index))); // sets \test to the index  of the bus, is this expected behaviour?
Ndef(\x).set(\test, Ndef(\k).asMap[0]);

what could I be doing wrong? :slight_smile:

all the best,
moritz

7

you need to call .asMap on a Bus:

b=Bus.audio;
Ndef(\x).set(\test,b.asMap);
1 Like