How to create a multi channel track

[pyquest]

I'm trying to expand on the example file but cant find documentation on adding multiple channels.

what if I wanted say 3 channels.

Channel 1: degrees = [60, 62, 64, 65, 67, 69, 71, 72]

Channel 2: degrees = [72, 71, 69, 67, 65, 64, 62, 60]

Channel 3: degrees = [50, ---- 50, ---- 50, ---- 50]

how can I accomplish this

#!/usr/bin/env python

from midiutil import MIDIFile

degrees  = [60, 62, 64, 65, 67, 69, 71, 72]  # MIDI note number
track    = 0
channel  = 0
time     = 0    # In beats
duration = 1    # In beats
tempo    = 60   # In BPM
volume   = 100  # 0-127, as per the MIDI standard

MyMIDI = MIDIFile(1)  # One track, defaults to format 1 (tempo track is created
                      # automatically)
MyMIDI.addTempo(track, time, tempo)

for i, pitch in enumerate(degrees):
    MyMIDI.addNote(track, channel, pitch, time + i, duration, volume)

with open("major-scale.mid", "wb") as output_file:
    MyMIDI.writeFile(output_file)

[introt]

Hi! You don't need to add a channel manually, just give a different one as an argument to addNote.

Here's an example script using your degrees:

#!/usr/bin/env python

from midiutil import MIDIFile

degrees  = [60, 62, 64, 65, 67, 69, 71, 72]  # MIDI note number
track    = 0
channel  = 0
time     = 0    # In beats
duration = 1    # In beats
tempo    = 60   # In BPM
volume   = 100  # 0-127, as per the MIDI standard

MyMIDI = MIDIFile(1)  # One track, defaults to format 1 (tempo track is created
                      # automatically)
MyMIDI.addTempo(track, time, tempo)

def addNotes(channel, degrees):
    for i, pitch in enumerate(degrees):
        if pitch >= 0:  # MIDI note numbers are greater than zero, so this
                        # allows skipping beats using negative degrees
            MyMIDI.addNote(track, channel, pitch, time + i, duration, volume)

addNotes(channel=channel,  # function argument "channel" gets the variable "channel"
        degrees=degrees)   # same with degrees

addNotes(channel=1,  # here's a more direct approach
        degrees=[72, 71, 69, 67, 65, 64, 62, 60])

addNotes(channel=2,  # the same with some beats skipped
        degrees=[50, -1, 50, -1, 50, -1, 50])

with open("pyquest.mid", "wb") as output_file:
    MyMIDI.writeFile(output_file)

And here's the resulting MIDI in MuseScore:

Hope this helps!