However, while setting a mixer works with a sine wave, as soon as I use an AudioPlayer, it says – line unsupported.

Cannot find a class or type named “Mixer”.

=== Minim Error ===
=== Minim.getLineOut: attempt failed, could not secure a LineOut.

Not setting the OutputMixer with Minim and setting the soundcard as output in the systempreferences, I can use Minim.MONO and Minim.STEREO on two channels. But with setting the mixer with minim.setOutputMixer to the MAYA44, I get an ERROR in any cases.

It doesn’t accept getLineOut(Minim.STEREO); or getLineOut(Minim.MONO); because (this is what I think) it has 4 channel analog line outputs/inputs, which are neither MONO or STEREO, but just channel numbers..

Just had to complete a quick project that required different mp3 files playing to different sound channels. Processing can accomplish this, here’s how I solved it:

import ddf.minim.*;
import ddf.minim.signals.*;
import javax.sound.sampled.*;

Minim minim1;
Minim minim2;

AudioOutput out1;
AudioOutput out2;

AudioPlayer song1;
AudioPlayer song2;

Mixer.Info[] mixerInfo;

void setup()
{
size(512, 256);

minim1 = new Minim(this);
minim2 = new Minim(this);

//–GET THE LIST OF AVAILABLE MIXERS
mixerInfo = AudioSystem.getMixerInfo();

println(AudioSystem.getMixerInfo());

//–SELECT A MIXER BASED ON THE INDEX IN THE mixerInfo ARRAY
mixer1 = AudioSystem.getMixer(mixerInfo[1]);
mixer2 = AudioSystem.getMixer(mixerInfo[2]);

minim1.setOutputMixer(mixer1);
minim2.setOutputMixer(mixer2);

out1 = minim1.getLineOut(Minim.STEREO);
out2 = minim2.getLineOut(Minim.STEREO);

song1 = minim1.loadFile(“YOUR SONG FILE.mp3″);
song2 = minim2.loadFile(“YOUR SONG FILE.mp3″);

song1.play();
song2.play();
}

void stop()
{
//–ALWAYS CLOSE THE SONG
song1.close();
song2.close();

//–ALWAYS STOP THE MINIM
minim1.stop();
minim2.stop();

//–CLOSE THE OUT CHANNEL
out1.close();
out2.close();

//–ALWATSYS STOP .super()
super.stop();
}

I’ve cut down the code to past here so may not work first time.

/**
* This sketch demonstrates how to use the setOutputMixer
* method of Minim in conjunction with the getLineOut
* method. By accessing the Mixer objects of Javasound, you can find one that
* corresponds to the output mixer of the sound device of your choice. You can
* then set this Mixer as the one that should use when creating an AudioOutput for you.
* This Mixer will also be used when obtaining outputs for AudioPlayers, AudioSamples,
* and any other classes that result in sound being ouput to your speakers.
*
* This sketch uses controlP5 for the GUI, a user-contributed Processing library.
*/

import ddf.minim.*;
// need signals package for SineWave

import ddf.minim.signals.*;
import controlP5.*;
AudioSample kick;
AudioSample snare;

// need to import this so we can use Mixer and Mixer.Info objects
import javax.sound.sampled.*;

Minim minim;
AudioOutput out;
// an array of info objects describing all of
// the mixers the AudioSystem has. we’ll use
// this to populate our gui scroll list and
// also to obtain an actual Mixer when the
// user clicks on an item in the list.
Mixer.Info[] mixerInfo;

// a signal for our output
SineWave sine;

ControlP5 gui;

void setup()
{
size(512, 200, P3D);

minim = new Minim(this);
gui = new ControlP5(this);

ScrollList mixers = gui.addScrollList(“Mixers”, 10, 10, 475, 280);
mixers.setLabel(“Choose A Mixer”);

mixerInfo = AudioSystem.getMixerInfo();

for(int i = 0; i < mixerInfo.length; i++)
{
controlP5.Button b = mixers.addItem("item"+i, i);
b.setLabel(mixerInfo[i].getName());
}

sine = new SineWave(220, 0.3, 44100);

}

void draw()
{
background(0);

//gui.draw();

if ( out != null )
{
stroke(255);
// draw the waveforms
for(int i = 0; i < out.bufferSize() – 1; i++)
{
line(i, 50 + out.left.get(i)*50, i+1, 50 + out.left.get(i+1)*50);
line(i, 150 + out.right.get(i)*50, i+1, 150 + out.right.get(i+1)*50);
}
}
}

public void controlEvent(ControlEvent theEvent)
{
int mixerIndex = (int)theEvent.controller().value();

println("User chose " + theEvent.controller().label());
println("Using mixer info " + mixerInfo[mixerIndex].getName());

Mixer mixer = AudioSystem.getMixer(mixerInfo[mixerIndex]);

minim.setOutputMixer(mixer);
// load BD.wav from the data folder
kick = minim.loadSample("file1.wav", 2048);
if ( kick == null ) println("Didn't get kick!");
// load SD.wav from the data folder
snare = minim.loadSample("file2.wav", 2048);
if ( snare == null ) println("Didn't get snare!");

if ( out != null )
{
out.close();
}

out = minim.getLineOut(Minim.STEREO);

if ( out != null )
{
snare.trigger();
}
}
void keyPressed()
{
if ( key == 's' ) snare.trigger();
if ( key == 'k' ) kick.trigger();
}

void stop()
{ // always close Minim audio classes when you are done with them
kick.close();
snare.close();
// always close Minim audio classes when you are done with them
if ( out != null )
{
out.close();
}
minim.stop();

super.stop();
}