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"""
06-midi-out.py - Sending MIDI events from pyo.
This program gives an example of how to build an algorithm with python/pyo and
then send MIDI events from the Server to a connected MIDI synthesizer (physical
or virtual).
Available MIDI output methods (see the Server documentation for the details):
- afterout(pitch, velocity, channel=0, timestamp=0)
- bendout(value, channel=0, timestamp=0)
- ctlout(ctlnum, value, channel=0, timestamp=0)
- makenote(pitch, velocity, duration, channel=0)
- noteout(pitch, velocity, channel=0, timestamp=0)
- pressout(value, channel=0, timestamp=0)
- programout(value, channel=0, timestamp=0)
- sysexout(msg, timestamp=0)
"""
import random
from pyo import *
pm_list_devices()
s = Server()
# Open all MIDI output devices.
s.setMidiOutputDevice(99)
# Then boot the Server.
s.boot()
# Generates an audio ramp from 36 to 84, from
# which MIDI pitches will be extracted.
pitch = Phasor(freq=11, mul=48, add=36)
# Global variable to count the down and up beats.
count = 0
def midi_event():
global count
# Retrieve the value of the pitch audio stream and convert it to an int.
pit = int(pitch.get())
# If the count is 0 (down beat), play a louder and longer event, otherwise
# play a softer and shorter one.
if count == 0:
vel = random.randint(90, 110)
dur = 500
else:
vel = random.randint(50, 70)
dur = 125
# Increase and wrap the count to generate a 4 beats sequence.
count = (count + 1) % 4
print("pitch: %d, velocity: %d, duration: %d" % (pit, vel, dur))
# The Server's `makenote` method generates a noteon event immediately
# and the correponding noteoff event after `duration` milliseconds.
s.makenote(pitch=pit, velocity=vel, duration=dur)
# Generates a MIDI event every 125 milliseconds.
pat = Pattern(midi_event, 0.125).play()
s.gui(locals())
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