!function() {
	var contexts = [...Array(9).keys()].map(_=>new AudioContext),
		trackLen,
		timeout,
		nodes=[]
	
	p0 = (params) => {
		var tempo = 1/8
		
		nodes.map(o => o.stop())
		nodes = []
		clearTimeout(timeout)
		
		var now = contexts[0].currentTime
		
		params[trackLen = 0].replace(/[\!\|]/g,'').split('\n').map((track, trackI) => {
			if(track) {
				if(track*1) {
					tempo = track/1000
				} else {
					var context = contexts[trackI]
					var now = context.currentTime
					var node = new OscillatorNode(context)
					var gain = new GainNode(context)
					
					const real = new Float32Array(3)
					const imag = new Float32Array(3)
					real[0] = 0
					imag[0] = 0
					real[1] = 1
					imag[1] = 0
					real[2] = 1
					imag[2] = 0
					const wave = context.createPeriodicWave(real, imag)
					node.setPeriodicWave(wave)
					
					node.connect(gain).connect(context.destination)
					//if(!nodes[0])node.type = "triangle"
					
					track.split('').map((letter, i) => {
						var duration = 1,
							note = letter.charCodeAt(0)
						note -= note>90 ? 71 : 65
						while(track[i+duration]=='-') {
							duration++
						}
						if(trackLen<i)trackLen=i+1
						if(note>=0) {
							node.frequency.setValueAtTime(65.406 * 1.06 ** note, now+i*tempo)
							if(i) {
								gain.gain.setTargetAtTime(0, now+(i-.5)*tempo, .05)
							} else {
								gain.gain.setTargetAtTime(1, now+.01, .05)
							}
							gain.gain.setTargetAtTime(1, now+i*tempo, .01)
						}
					})
					
					gain.gain.value = 0
					gain.gain.setTargetAtTime(0, now+(trackLen-.5)*tempo, .01)
					nodes.push(node)
				}
			}
		})
		
		nodes.map(node => node.start())
		timeout = setTimeout(() => p0(params), trackLen*1000*tempo)
	}
}()