Python-Midi-Ableton

A tutorial on how to send midi signals from a python script to a midi track in ableton live

What you'll need:

• Python (duh...), I am using (python 3.7.3)[https://www.python.org/downloads/]
• Pip install this package pip install python-rtmidi
• Install this software: loopMidi by Tobias Erichsen
• A DAW (short for Digital Audio Workstation), I am using Ableton live 10 Standard 10.0.6
• Windows?

Why is this relevant:

• Because I couldn't find any resources on how to send Midi Notes from a Python script to Ableton for windows
• You want to send Midi Signals from Python to Ableton Live on a Windows pc

What are we actually going to do:

1. We can't communicate directly between ableton live and python
2. We need to create a virtual port to which we can send midi signals from python and to which ableton will be "listening" to
3. We need to write a script that send midi signals, for that purpose we will use the python-rtmidi package
4. We need to setup ableton to listen to the port

What you'll have to do:

1. Install python and the python rt-midi package
2. Install the loopMidi software, once you launch it you should see something like this:
3. Now press the little plus button in the bottom-left corner: You'll see that it'll add an item to list. Voila, we created a new port.
4. Now let's write the python script that'll send some notes to the port:

import time
import rtmidi

midiout = rtmidi.MidiOut()
available_ports = midiout.get_ports()

# here we're printing the ports to check that we see the one that loopMidi created. 
# In the list we should see a port called "loopMIDI port".
print(available_ports)

# Attempt to open the port
if available_ports:
    midiout.open_port(1)
else:
    midiout.open_virtual_port("My virtual output")

note_on = [0x90, 60, 112]
note_off = [0x80, 60, 0]
midiout.send_message(note_on)
time.sleep(0.5) 
# I tried running the script without having to invoke the sleep function but it doesn't work. 
# If someone could enlighten me as to why this is, I'd be more than grateful.
midiout.send_message(note_off)

del midiout

Here we're simply sending a middle C note as MIDI to the port. Save this in a .py file, we'll need to run it later.

5. Now let's set up Ableton:

   • Go to Preferences -> MIDI link where you should see the loopMidi port as an input and output port. Set the loopMidi port's track and sync to "On"
   • Create a new Midi track in your project
   • Set the input of the track to be the "loopMidi Port" and set the track to "In"
   • Also don't forget to load the track with a synth. An ableton stock sound should also do the trick.

6. Run the script python "scriptname".py in your command prompt, and you should be able to hear ableton play back a C note at you.

I hope this helped, if anything is unclear or you have suggestions let me know.