01-midi-scan.py - Scan for MIDI channels and controller numbers.
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CtlScan and CtlScan2 objects are useful to find controller numbers used
by your MIDI devices.

List of MIDI-related functions:

- pm_count_devices:
    Returns the number of devices found by Portmidi.
- pm_get_default_input:
    Returns the index number of Portmidi's default input device.
- pm_get_default_output:
    Returns the index number of Portmidi's default output device.
- pm_get_input_devices:
    Returns midi input devices (device names, device indexes) found by Portmidi.
- pm_get_output_devices:
    Returns midi output devices (device names, device indexes) found by Portmidi.
- pm_list_devices:
    Prints a list of all devices found by Portmidi.

.. code-block:: python

    from pyo import *
    
    # Print the list of available MIDI devices to the console.
    pm_list_devices()
    
    s = Server(duplex=0)
    
    # Give the ID of the desired device (as listed by pm_list_devices()) to the
    # setMidiInputDevice() of the Server. A bigger number than the higher device
    # ID will open all connected MIDI devices.
    s.setMidiInputDevice(99)
    
    # The MIDI device must be set before booting the server.
    s.boot().start()
    
    print("Play with your Midi controllers...")
    
    # Function called by CtlScan2 object.
    def scanner(ctlnum, midichnl):
        print("MIDI channel: %d, controller number: %d" % (midichnl, ctlnum))
    
    
    # Listen to controller input.
    scan = CtlScan2(scanner, toprint=False)
    
    s.gui(locals())