How do I manipulate musical notes using Python?

[noisefloor]

Hi,

I know this is a very basic python problem but I do not know exactly how to search for an answer here.

No it's not. To be precise, it has nothing to do with Python in a strict sense. What you are looking for is a Python module which cannot only print tracks - as shown in your example, but can access the actual MIDI date and manipulate it. The mido module you are using seems to be able to do so.

After a quick read through https://mido.readthedocs.io/en/latest/intro.html I think it's fairly easy: iterate of the messages of a MIDI file, copy the current message and alter the note at the same time, write the message to a new file. Done - I guess ;-)

Gruß, noisefloor