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#!/usr/bin/env python
# encoding: utf-8
"""
The Melo class records 16 notes in a table and reads it at variable speed.
"""
from pyo import *
import random
s = Server(duplex=0).boot()
SCALES = [[0, 2, 5, 7, 9, 11], [0, 2, 3, 7, 8, 11], [0, 3, 5, 7, 8, 10]]
class Melo:
def __init__(self, amp=0.1, speed=1, midirange=(48, 84)):
# table to record new melody fragment
self.table = NewTable(2)
# loopseg generation
self.base_mel = XnoiseMidi(dist=12, freq=8, x1=1, x2=0.25, scale=0, mrange=midirange)
# snap on scale and convert to hertz
self.base_melo = Snap(self.base_mel, choice=[0, 2, 4, 5, 7, 9, 11], scale=1)
# record a new fragment every 10 seconds
self.trig_rec = Metro(time=10).play()
self.tab_rec = TrigTableRec(self.base_melo, self.trig_rec, self.table)
# rise amp of the oscillators after the first recording
self.amp = Counter(self.tab_rec["trig"], min=1, max=2, mul=amp)
# random speed for the oscillator reading the melody table + portamento
self.speed = Choice(choice=[0.0625, 0.125, 0.125, 0.125, 0.25, 0.5], freq=1.0 * speed)
self.freq = Osc(self.table, self.speed * speed)
self.freq_port = Port(self.freq, risetime=0.01, falltime=0.01)
# 8 randis (freq and amp) to create a chorus of oscillators
self.rnd_chorus = Randi(min=0.99, max=1.01, freq=[random.uniform(3, 6) for i in range(8)])
self.rnd_amp = Randi(min=0, max=0.15, freq=[random.uniform(0.2, 0.5) for i in range(8)])
# oscillators...
self.osc = LFO(
self.freq_port * self.rnd_chorus, type=3, sharp=0.75, mul=Port(self.amp, mul=self.rnd_amp),
).out()
def setScale(self, scl):
self.base_melo.choice = scl
def choose_scale():
scl = random.choice(SCALES)
for obj in objs:
obj.setScale(scl)
a = Melo(amp=0.3, speed=1, midirange=(60, 84))
b = Melo(amp=0.6, speed=0.5, midirange=(48, 72))
c = Melo(amp=1, speed=0.25, midirange=(36, 60))
objs = [a, b, c]
pat = Pattern(time=20, function=choose_scale).play()
s.gui(locals())
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