python-rtmidi/examples/wavetablemodstep.py at master · SpotlightKid/python-rtmidi · GitHub

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#!/usr/bin/env python

# -*- coding: utf-8 -*-

# wavetablemodstep.py

"""Play a note and step through MIDI Control Change #1 (modulation) values.

Optionally allows to send a Control Change #70 first, to set the wavetable

of the current sound on a Waldorf Microwave II/XT(k) synthesizer.

I use this with a Microwave sound program where the CC #1 is mapped to

wavetable position of oscillator 1. This script then allows me to listen to

all the waves in a selected wavetable in succession.

"""

import time

import rtmidi

from rtmidi.midiconstants import (CONTROL_CHANGE, MODULATION_WHEEL,

NOTE_OFF, NOTE_ON, RESET_ALL_CONTROLLERS)

CC_SET_WAVETABLE = 70

class Midi(object):

"""Encapsulate MIDI output."""

def __init__(self, port):

self.midi = rtmidi.MidiOut()

self.midi.open_port(port)

def play_stepping(self, note, cc, dur=0.2, step=1, vel=64, rvel=None, ch=0):

"""Play given note and step through ctrl values over time."""

# note on

note &= 0x7F

ch &= 0x0F

self.midi.send_message([CONTROL_CHANGE | ch, cc, 0])

time.sleep(0.1)

self.midi.send_message([NOTE_ON | ch, note, vel & 0x7F])

# step through modulation controller values

for i in range(0, 128, step):

self.midi.send_message([CONTROL_CHANGE | ch, cc, i])

time.sleep(dur)

# note off

self.midi.send_message(

[NOTE_OFF | ch, note, (vel if rvel is None else rvel) & 0x7F])

def reset_controllers(self, ch=0):

"""Reset controllers on given channel."""

self.midi.send_message(

[CONTROL_CHANGE | (ch & 0xF), RESET_ALL_CONTROLLERS, 0])

def set_wavetable(self, wt, ch=0):

"""Set wavetable for current sound to given number."""

self.midi.send_message(

[CONTROL_CHANGE | (ch & 0xF), CC_SET_WAVETABLE, wt & 0x7F])

def close(self):

"""Close MIDI outpurt."""

self.midi.close_port()

del self.midi

if __name__ == '__main__':

import argparse

argparser = argparse.ArgumentParser()

aadd = argparser.add_argument

aadd('-c', '--channel', type=int, default=1,

help="MIDI channel (1-based, default: %(default)s)")

aadd('-C', '--controller', type=int, default=MODULATION_WHEEL,

help="MIDI controller number (default: %(default)s)")

aadd('-p', '--port', type=int, default=0,

help="MIDI output port (default: %(default)s)")

aadd('-l', '--length', type=float, default=0.3,

help="Length (in sec.) of each wave (default: %(default)s)")

aadd('-n', '--note', type=int, default=60,

help="MIDI note number to play (default: %(default)s)")

aadd('-w', '--wavetable', type=int,

help="Send CC #70 to set wavetable number (1-based, default: none)")

args = argparser.parse_args()

m = Midi(args.port)

ch = max(0, args.channel - 1)

if args.wavetable:

m.set_wavetable(args.wavetable - 1, ch=args.channel - 1)

time.sleep(0.1)

try:

m.reset_controllers(ch)

m.play_stepping(args.note, args.controller, dur=args.length, step=2, ch=ch)

finally:

m.reset_controllers(ch)

m.close()

python-rtmidi/examples/wavetablemodstep.py at master · SpotlightKid/python-rtmidi · GitHub

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