Transpose

[Mickinator]

Hi,
My name is Norbert, i' m 66 and very new with python and mido, but it' s wonderful.

I use a raspi 3B with python and mido for controlling purposes.
I understood, that mido works with messages (e.g. note on = H90 H60 H 30).
I can receive and send it.
But now I want to change the values of each Byte. E.g. I like to change -

• the channel (Statusbyte),
• or the first databyte (notenumber),
• or 2nd databyte (velocity) etc. in single processes.
  I would be very happy, if someone can give me short and simple examples how to do that.
  Thanx for helping
  Norbert

[GreyAlien502]

Hi Morbert,
To modify messages, you can set the properties of the mido.Message objects found in a track.
Here is an example to transpose all notes in a file up 1 octave and save the output to a new file:

import mido
midi_file = mido.MidiFile("path/to/file")
for message in midi_file.tracks[0]:
 if message.type in ('note_on','note_off'):
  message.note += 12
midi_file.save("path/to/transposed/file")

Changing the channel or velocity can be done the same way.
There is more information on the Message objects here:
https://mido.readthedocs.io/en/latest/messages.html

[Mickinator]

Hi Grey Alien502, thanx for your answer. It helps, if I want to send a midi-file. But thats not my problem. Zynthian has the controller transpose. You can find it in Options. It wouldt be very good to edit this parameter via midi ( with a CC or with a note command on master channel.) Regards & stay healthy Norbert von Norbert Schreiber gesendet

…

-----Original-Nachricht----- Von: GreyAlien502 <[email protected] <mailto:[email protected]> > Betreff: Re: [mido/mido] Transpose (#223) Datum: 11.04.2020, 01:29 Uhr An: mido/mido <[email protected] <mailto:[email protected]> > CC: Micki <[email protected] <mailto:[email protected]> >, Author < [email protected] <mailto:[email protected]> > Hi Morbert, To modify messages, you can set the properties of the mido.Message objects found in a track. Here is an example to transpose all notes in a file up 1 octave and save the output to a new file: import mido midi_file = mido.MidiFile("path/to/file") for message in midi_file.tracks[0]: if message.type in ('note_on','note_off'): message.note += 12 midi_file.save("path/to/transposed/file") Changing the channel or velocity can be done the same way. There is more information on the Message objects here: <https://mido.readthedocs.io/en/latest/messages.html> — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#223 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ANJNSQJSLPQC3646MRO6VHTRL6TWJANCNFSM4LJTYNBA> .

[rdoursenaud]

That's a feature you'd have to ask Zynthian for.
Nothing mido can do about it.