organ2.go

package main

import (
	"github.com/koyachi/go-asynth"
	"github.com/koyachi/go-baudio"
	"math"
)

func main() {
	s := asynth.New(func(note asynth.Note, t float64) float64 {
		freq := 440.0 * math.Pow(2, float64(note.Key-49)/12)
		x := math.Sin(1.0 * math.Pi * t * freq)
		x1 := math.Sin(1.2*math.Pi*t*freq + math.Pi*0.1)
		x2 := math.Sin(1.2*math.Pi*t*freq + math.Pi*0.2)
		x3 := math.Sin(1.2*math.Pi*t*freq + math.Pi*0.3)
		y := math.Sin(2.0 * math.Pi * t * freq / 4)
		return x*0.2 + x1*0.1 + x2*0.1 + x3*0.1 + y*0.5
	})
	s.Play(nil)
}