Simple Question about output

Questions
1

in this code the output alternates between outputs 0 and 1

(
SynthDef(\pong,{
	var sig, ping;
	ping =LFPulse.kr(1);
	sig = Pulse.ar(300) * 0.1;
	Out.ar(ping, sig);
}).add;
)

x = Synth(\pong);

but curious why once Pulse is made multi-channel output 1 of stay open


(
SynthDef(\pong,{
	var sig, ping,env;
	ping =LFPulse.kr(2,width:0.5);
	sig = Pulse.ar([300, 600]) * 0.1;
	Out.ar(ping, sig);
}).add;
)

x = Synth(\pong);

Was expecting output 0 and 1 to still alternate but hear 300 and then 600…

2

sig is a 2-channel array: [Pulse.ar(300), Pulse.ar(600)]

when ping is 0, the first element of the array is output on Bus 0 and the second element on Bus 1. so both 300 and 600 cycles are heard.

when ping is 1, the first element of the array is output on 1 and the second on 2 (which may not make any sound on your system!)

3

Im still a bit fuzzy on it - sorry

I was assuming that as Im not summing the sig that
0 would correspond to 300
1 would correspond to 600
and as the pulse went up and down Id hear ch 0 / 300 and ch 1 / 600

in essence is they way I’m understanding is the incorrect as the way Im seeing it my single channel version should only omit sound from 0… ugh

4

What really happens is that the ping signal is shifting a fully stereo output between buses 0-1 and buses 1-2.

You could do:

Out.ar(0, Balance2.ar(sig[0], sig[1], ping * 2 - 1));

That is, ask the system directly for the result you want, instead of doing something tricky.

(Also, with Balance2, you can .lag the ping signal, and get a crossfade for free.)

hjh

5

yes this %100 makes the effect I was thinking I would get… why did I assume it was two mono signals I working with I wonder… hmm need to think a bit

6

Probably because the Out UGens are among the few that don’t multichannel expand array inputs: SinOsc.ar([300, 400]) produces two SinOscs, each with one frequency. But Out.ar(bus, [left, right]) does not produce two Outs – it produces only one, putting the channels onto successive buses.

hjh

7

I see
I was thinking each new channel would funnel straight out unless summed or mixed or some other direction given to it