An EventEmitter-based step-sequencer for Node.js.
var StepSequencer = require('step-sequencer');
// Instantiate a new StepSequencer object
var tempo = 120;
var division = 4;
var sequence = [0, 1, 2, 3];
var stepSequencer = new StepSequencer(tempo, division, sequence);
// The StepSequencer emits the number of
// the step when that step is to be played
stepSequencer.on('0', function (step) {
console.log(step);
})
.on('1', function (step) {
console.log(step);
})
.on('2', function (step) {
console.log(step);
})
.on('3', function (step) {
console.log(step);
});
// Begin playing the sequence
stepSequencer.play();
// 0
// 1
// 2
// 3 ...
Constructrs the StepSequencer
object:
var stepSequencer = new StepSequencer(tempo = 120, division = 4, sequence = []);
tempo
is the tempo of playbackdivision
is the number of beats per measuresequence
is the sequence of data to be emitted
Begins playing the sequence:
stepSequencer.play();
// 0
// 1
// 2
// 3 ...
Stops playing the sequence, does not reset the current step:
// 0
// 1
stepSequencer.stop();
Resumes playing from the current step. Continued from the previous example:
stepSequencer.resume();
// 2
// 3 ...
Sets the tempo, even if the stepSequencer
is playing:
stepSequencer.setTempo(120);
Sets the division and sequence, even if the stepSequencer
is playing.
The tempo is updated as well, if the division changes:
stepSequencer.setSequence(4, [1, 2, 3, 4]);
MIT