[chuck-users] Why does the gain increase each time through the loop
John Ellinger
info at mibac.com
Thu Sep 13 12:11:20 EDT 2012
Hi all,
After attending the SLEO conference last spring I was inspired to start a laptop group at Carleton College. I've run into a problem I don't understand. I'm using chuck version: 1.3.1.1 (chimera) mac os x : intel : 64-bit
I've interfaced a 4x4 numeric touchpad to an Arduino controller that sends MIDI to Chuck. The MIDI reception works fine. I mapped keypad number 1 to a kick drum sample which works fine. The problem is every time I press keypad 1 the gain increases. This skeleton code illustrates the issue.
============================
// gain test
SndBuf bufKick => blackhole;
// change to your path
"/Users/je/Documents/ArduinoXCode/midikeypad_git/chuck_pad/data/kick.wav" => bufKick.read;
// set the kick gain
0.5 => bufKick.gain;
// get the kick duration
bufKick.length() => dur bufKickDur;
function void playKick()
{
0 => bufKick.pos;
bufKick => dac;
bufKickDur => now;
}
// infinite time-loop
while( true )
{
playKick();
1::second => now;
}
===============================
I've tried things like this
fun void playKick()
{
0 => bufKick.pos;
bufKick => Gain g => dac;
g.gain() => float oldgain;
bufKickDur => now;
oldgain => g.gain;
}
and this
fun void playKick()
{
0 => bufKick.pos;
bufKick => dac;
bufKick.gain() => float oldgain;
bufKickDur => now;
oldgain => bufKick.gain;
}
but the gain still increases on every button press. How can I keep the gain at a constant level?
It was a pleasure to meet and talk with Ge and Spencer at SLEO.
John
John Ellinger email: info at mibac.com
MiBAC Music Software 1019 College St.
Music Instruction By A Computer Northfield MN 55057
http://www.mibac.com
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