Colin Sullivan

/**
*  Overdrive/Distortion effect (meant for bass guitar)
*
*  Copyright (c) 2009 Colin Sullivan
*
*  Permission is hereby granted, free of charge, to any person obtaining a copy
*  of this software and associated documentation files (the "Software"), to deal
*  in the Software without restriction, including without limitation the rights
*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
*  copies of the Software, and to permit persons to whom the Software is
*  furnished to do so, subject to the following conditions:
*
*  The above copyright notice and this permission notice shall be included in
*  all copies or substantial portions of the Software.
*
*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
*  THE SOFTWARE.
**/

// patch
//envelope follower
adc => Gain g => OnePole p => blackhole;
//clean lows
adc => LPF lowpass => Gain lowClean => Gain mix;
//overdrive on lows
lowpass => Gen17 lowOD => mix;
//clean highs
adc => BPF highpass => Gain highClean => mix;
//overdrive on highs
adc => highpass => Gen17 highOD => mix;
//mix them together
mix => dac;

//master Levels
mix.gain(0);
1  => float masterVolumeLimit;

//low levels
lowClean.gain(1); //1
lowOD.gain(0); //0.3

//high levels
highClean.gain(1); //0.3
highOD.gain(0); //1

//frequency of pass filters
lowpass.freq(1000);
highpass.set(1000, 1000/(1200-800) );

//square input
adc => g;
//multiply
3 => g.op;
// set pole position
0.9999 => p.pole;

// load up the coeffs; amplitudes for successive partials
lowOD.coefs( [ 1., 0.5, 0, 0.5, 1. ] ); //Nice fat fuzz
//lowOD.coefs( [1., 0.5, 0, -0.5, -1.] );  //thrashy, but buzz
//lowOD.coefs( [.99, .88, 0, .88, -.99] );	//loud and farty fuzz
// load up the coeffs; amplitudes for successive partials
//highOD.coefs( [ 1., 0.5, 0, 0.5, 1. ] );
//highOD.coefs( [1., 0.5, 0, -0.5, -1.] );
//highOD.coefs( [.99, .88, 0, .88, -.99] );
//highOD.coefs( [0.5, 0, -0.5] );
highOD.coefs( [.256, -.576, .432, -.120, .9] ); //not grungy enough

//master volume
0 => float masterVolume;
0 => float i;

// will hold last value of filter
0 => float pLast;
// full overdrive flag
0 => int fullOD;

// Allows output to chuck~ object outlet in Max/MSP
MaxMessage m;

while (true) {
  while(masterVolume < masterVolumeLimit) {
    mix.gain(masterVolume);
    0.001 +=> masterVolume;
    1::ms => now;
  }

  // Get last value of filter
  p.last()*50 => pLast;

  // Debug to max
  //pLast => m.floatout;

  // Set high overdrive gain based on dynamics of playing
  if(pLast < 1 && fullOD == 0)
  {
    highOD.gain(pLast);
    lowOD.gain(0.3*pLast);
  }
  else if(pLast >= 1)
  {
    highOD.gain(1);
    lowOD.gain(0.3);
    1 => fullOD;
  }
  else if(pLast < 0.5 && fullOD == 1)
  {
    // turn fullOD flag off if done lowering
    if(highOD.gain() - pLast < 0.001)
    {
      0 => fullOD;
    }
    else
    {
      // Lower gain
      highOD.gain(highOD.gain() - 0.001);
    }
  }
  0.01 +=> i;
  1::ms => now;
}