package vafusion.inst;
import jm.audio.Instrument;
import jm.audio.io.*;
import jm.audio.synth.*;
import jm.music.data.Note;
import jm.audio.AudioObject;
/**
* A sawtooth waveform instrument implementation
* which iincludes a low pass filter that is swept by
* an envelope and uses the multiply object to scale
* the filter envelope depth. A second oscillator is added
* and detuned slightly to give a fat chorused effect.
* @author Andrew Brown
*/
public final class SawLPFInstG extends Instrument{
//----------------------------------------------
// Attributes
//----------------------------------------------
private int sampleRate;
private int filterCutoff;
private int channels;
//----------------------------------------------
// Constructor
//----------------------------------------------
/**
* Basic default constructor to set an initial
* sampling rate and buffersize in addition
* to the neccessary frequency relationships
* and volumes for each frequency to be added
* the instrument
* @param sampleRate
*/
public SawLPFInstG(int sampleRate){
this(sampleRate, 1000, 1);
}
/**
* Constructor that sets sample rate and the number of channels
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
*/
public SawLPFInstG(int sampleRate, int filterCutoff){
this(sampleRate, filterCutoff, 1);
}
/**
* Constructor that sets sample rate and the number of channels
* @param sampleRate The number of samples per second (quality)
* @param filterCutoff The frequency above which overtones are cut
* @param channels 1 for Mono or 2 for Stereo
*/
public SawLPFInstG(int sampleRate, int filterCutoff, int channels){
this.sampleRate = sampleRate;
this.filterCutoff = filterCutoff;
this.channels = channels;
}
//----------------------------------------------
// Methods
//----------------------------------------------
/**
* Initialisation method used to build the objects that
* this instrument will use and specify thier interconnections.
*/
@Override
public void createChain(){
// modulating LFO
Value freq = new Value(this, this.sampleRate, this.channels, (float)6.0);
Oscillator LFO = new Oscillator(freq, Oscillator.SINE_WAVE, Oscillator.FREQUENCY);
LFO.setAmp((float)3.0);
Envelope LFOenv = new Envelope(LFO,
new double[] {0.0, 0.0, 0.2, 0.4, 0.4, 1.0, 0.8, 1.0, 1.0, 0.0});
// constant
Value offsetFrequency = new Value(this, this.sampleRate, this.channels, Value.NOTE_PITCH);
AudioObject[] grp1 = {LFOenv, offsetFrequency};
Add add = new Add(grp1);
// Filter cutoff envelope control
Envelope filtEnv = new Envelope(this, this.sampleRate, this.channels,
new double[] {0.0, 0.0, 0.5, 1.0, 1.0, 0.0});
Value scalefactor = new Value(this, this.sampleRate, this.channels, (float)2000.0);
Multiply mult = new Multiply(new AudioObject[] {filtEnv, scalefactor});
// Waveform 1
Oscillator wave = new Oscillator(add, Oscillator.SAWTOOTH_WAVE, Oscillator.FREQUENCY);
// Filter
Filter filt = new Filter(new AudioObject[] {wave, mult}, this.filterCutoff, Filter.LOW_PASS);
// Envelope gnerator
Envelope env = new Envelope(filt,
new double[] {0.0, 0.0, 0.05, 1.0, 0.2, 0.4, 0.8, 0.3, 1.0, 0.0});
// respond to note dynamics
Volume vol = new Volume(env);
// save to a file
SampleOut sout = new SampleOut(vol);
}
}