With your Raspberry Pi Pico MIDI controller all assembled, you're ready to jam! You can use it with any software that allows MIDI input. Most commonly, you'll use a MIDI controller with music production software such as Reason, Garage Band, FL Studio, Ableton Live, etc.
You could use the MIDI device for recording your own music with MIDI or for playing live. With the MIDI mapping, you can create unique arrangements on the fly without having to go back and forth between software and the device. In a live situation, the added control of the quick mapping opens up a world of possibilities.