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 Forum index » DIY Hardware and Software » Supercollider
flies' noob questions
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flies



Joined: May 20, 2008
Posts: 29
Location: NJ

PostPosted: Wed Sep 02, 2009 3:50 pm    Post subject: flies' noob questions
Subject description: attenuate and play an audio bus
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so, unless ppl think this is a bad idea, i'm going to bundle all my noob questions together. this may make them less searchable but it won't clog the board with my mess.

here's my current problem: i want to send the output of a two synths to one bus, and attenuate that bus, then send the attenuated sum to speakers.

here's what i've got (working off of the busses tutorial)

Code:
s.reboot;
(
  SynthDef("tutorial-Infreq", { arg inBus, outBus, freqOffset = 0;
    // this will add freqOffset to whatever is read in from the bus
    Out.ar(outBus, SinOsc.ar(In.kr(inBus) + freqOffset, 0, 0.5));
  }).send(s);

  SynthDef("tutorial-Outfreq", {
    arg centerFreq = 400, modFreq = centerFreq/2, modAmount = 0.025, bus;
    Out.kr(bus, SinOsc.kr(modFreq, 0, centerFreq*modAmount, centerFreq));
    }).send(s);
  b = Bus.control(s,1);
  c = Bus.audio(s,1);
)

(
  f = 1000;
  x = Synth.new("tutorial-Outfreq", [\bus, b,\modFreq,f, \modAmount,2]);
  y = Synth.after(x, "tutorial-Infreq", [\inBus, b,\outBus, c]);
  z = Synth.after(x, "tutorial-Infreq", [\inBus, b,\outBus, c, \freqOffset, 200]);
)

x.free; y.free; z.free;
b.free;


so, now i have this bus c, and i want to attenuate it then output it. how do i do that? [/code]
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dewdrop_world



Joined: Aug 28, 2006
Posts: 858
Location: Guangzhou, China
Audio files: 4

PostPosted: Fri Sep 04, 2009 9:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Attenuation = multiplication by a (positive) number less than 1.0

So you can use In.ar to read the signal from c, then multiply it, then Out.ar to bus 0 (main hardware output bus).

Or, if you want the mono signal to output in stereo:

Code:
Out.ar(0, (signal * attenuation) ! 2)


!2 duplicates the 1-channel signal into 2 channels.

James

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sc3 online: http://supercollider.sourceforge.net
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