Set volume of this example with Minim

Hello,
I would like to set the volume of this example. For example I would like to set the volume with mouse Y rather than resonance.

I think it is easy but I block. :face_with_raised_eyebrow:

// import everything necessary to make sound.
import ddf.minim.*;
import ddf.minim.ugens.*;

// create all of the variables that will need to be accessed in
// more than one methods (setup(), draw(), stop()).
Minim       minim;
AudioOutput out;
MoogFilter  moog;

// setup is run once at the beginning
void setup()
{
// initialize the drawing window
  size(300, 300);
  
  // initialize the minim and out objects
  minim   = new Minim(this);
  out     = minim.getLineOut();
  // construct a law pass MoogFilter with a 
  // cutoff frequency of 1200 Hz and a resonance of 0.5
  moog    = new MoogFilter( 1200, 0.5 );
  
  // we will filter a white noise source,
  // which will allow us to hear the result of filtering
  Noise noize = new Noise( 0.5f, Noise.Tint.RED );  

  // send the noise through the filter
  noize.patch( moog ).patch( out );
}

// we'll control the frequency and resonance of the filter
// using the position of the mouse, in typical x-y controller fashion
void mouseMoved()
{
  float freq = constrain( map( mouseX, 0, width, 200, 12000 ), 200, 12000 );
  float rez  = constrain( map( mouseY, height, 0, 0, 1 ), 0, 1 );
  
  moog.frequency.setLastValue( freq );// difference avec -freq
  moog.resonance.setLastValue( rez  );
}

void keyPressed()
{
  if ( key == '1' ) moog.type = MoogFilter.Type.LP;
  if ( key == '2' ) moog.type = MoogFilter.Type.HP;
  if ( key == '3' ) moog.type = MoogFilter.Type.BP;
}

// draw is run many times
void draw()
{
  // erase the window to black
  background( 0 );
  // draw using a white stroke
  stroke( 255 );
  // draw the waveforms
  for( int i = 0; i < out.bufferSize() - 1; i++ )
  {
    // find the x position of each buffer value
    float x1  =  map( i, 0, out.bufferSize(), 0, width );
    float x2  =  map( i+1, 0, out.bufferSize(), 0, width );
    // draw a line from one buffer position to the next for both channels
    line( x1, 50 + out.left.get(i)*50, x2, 50 + out.left.get(i+1)*50);
    line( x1, 150 + out.right.get(i)*50, x2, 150 + out.right.get(i+1)*50);
  } 
  
  text( "Filter type: " + moog.type, 10, 225 );
  text( "Filter cutoff: " + moog.frequency.getLastValue() + " Hz", 10, 245 );
  text( "Filter resonance: " + moog.resonance.getLastValue(), 10, 265 ); 
}



1 Like

Hi,

To set the volume, you can look at the setVolume() method for the AudioOutput class.

However I’ve tested myself on Processing 3.5.4 and it seems that this method is not supported :

So you can use the setGain() method in the mouseMoved() function that accepts decibels :

out.setGain(((float)mouseY / height) * 10);

However when printing the gain to the console, it stays limited at 6.0206 dB… Maybe someone have the solution :slight_smile:

(mouseY / height return a number between 0 and 1 and since you want to have a float division, you cast the first number before)

2 Likes