func playMelodySynth(ctx sound.Context, freqInput chan float64) (stream chan float64) {
freqInput1, freqInput2 := ctx.Fork2(freqInput)
return ctx.Add(
ctx.Mul(
ctx.Square(
freqInput1,
ctx.Const(0.5),
),
ctx.Const(0.75),
),
ctx.Mul(
ctx.Saw(
ctx.Mul(freqInput2, ctx.Const(2)),
),
ctx.Const(0.25),
),
)
}
func PlayTrebleNote(ctx sound.Context, freqInput chan float64, duration time.Duration) (stream chan float64) {
freqInput1, freqInput2 := ctx.Fork2(freqInput)
return ctx.TakeDuration(
ctx.Add(
ctx.Mul(
ctx.Square(
freqInput1,
ctx.Const(0.5),
),
ctx.Const(0.75),
),
ctx.Mul(
ctx.Saw(
ctx.Mul(freqInput2, ctx.Const(2)),
),
ctx.Const(0.25),
),
),
duration,
true,
)
}
func KarplusStrongSaw(ctx sound.Context, frequency, cutoff, decay float64) (output chan float64) {
delaySamples := uint((1.0 / frequency) * ctx.SampleRate)
wave := ctx.Saw(ctx.Const(frequency))
input := ctx.Take(wave, delaySamples, true)
return KarplusStrong(ctx, input, delaySamples, cutoff, decay)
}