3

I would like to know how can i send MIDI Control Change messages from a Python script to an application called rakarrack, which receives MIDI messages to change volumes, turn on/off FX's, etc. All this done via JACK/ALSA.

At this point i just try with the library python-rtmidi (the code i wrote is based on the example provided there), but when i try to send the messages, rakarrack doesn't do anything. I think because is not receiving anything. I already check the Preference in the application and the MIDI In device (which is created from Python) is listed as 'rtmidi' and selected.

import time
import rtmidi

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

if available_ports:
    midiout.open_port(0)
else:
    midiout.open_virtual_port("My virtual output")

control = [0x74, 116, 124] 
midiout.send_message(control)

del midiout

As you can see, I'm trying to send one control message [0x74, 116, 124] , I took those numbers from here: http://rakarrack.sourceforge.net/midiic.html

Improve this question

1 Answer 1

Reset to default
3

I need to send a "Chan 1 Control/Mode Change" message as the first byte, which is "0xb0", then 0x74 which is the control that i want change, and finally the value "124", which is turn on/off FX:

control = [0xb0, 0x74, 124]
Improve this answer
1
  • Stumbled across the same problem. The rtmidi lib has constants for those. You can from rtmidi.midiconstants import CONTROL_CHANGE which equals to 0xB0, for example. There are many more useful constants in there.
    – mefiX
    Aug 28 at 10:20

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.