func NewBeatsKey(idx int) Key {
osc := snd.NewOscil(sawsine, notes[idx], snd.NewOscil(triangle, 4, nil))
dmp := snd.NewDamp(bpm.Dur(), osc)
d := snd.BPM(float64(bpm) * 1.25).Dur()
dmp1 := snd.NewDamp(d, osc)
drv := snd.NewDrive(d, osc)
mix := snd.NewMixer(dmp, dmp1, drv)
frz := snd.NewFreeze(bpm.Dur()*4, mix)
adsr := snd.NewADSR(250*ms, 500*ms, 300*ms, 400*ms, 0.85, 1.0, frz)
key := &BeatsKey{snd.NewInstrument(adsr), adsr}
key.Off()
return key
}
sqsine = snd.SquareSynthesis(49)
sine = snd.Sine()
triangle = snd.Triangle()
notes = snd.EqualTempermant(12, 440, 48)
keys [12]Key
reverb snd.Sound
metronome snd.Sound
loop *snd.Loop
lowpass *snd.LowPass
keymix *snd.Mixer
keygain *snd.Gain
master *snd.Mixer
mastergain *snd.Gain
bpm = snd.BPM(80)
loopdur = snd.Dtof(bpm.Dur(), snd.DefaultSampleRate) * 8 //nframes
sndbank = []KeyFunc{NewPianoKey, NewWobbleKey, NewBeatsKey}
sndbankpos = 0
ms = time.Millisecond
)
func makekeys() {
keymix.Empty()
for i := range keys {
keys[i] = sndbank[sndbankpos](51 + i) // notes[51] is Major C
keys[i].Freeze()
keymix.Append(keys[i])
}