note_repeater.py

import sys, pygame, pygame.midi
import time
# set up pygame
M_NOTE_ON = 144
M_NOTE_OFF = 128
M_RIBBON_ON = 100
pygame.init()
pygame.midi.init()

# list all midi devices
for x in range(0, pygame.midi.get_count()):
    print(str(x) + ': ' + str(pygame.midi.get_device_info(x)))

# open a specific midi device
# inp = pygame.midi.Input(1)
inp = pygame.midi.Input(pygame.midi.get_default_input_id())

# run the event loop
port = pygame.midi.get_default_output_id()
# port = 2
print("using output_id :%s:" % port)
midi_out = pygame.midi.Output(port)
midi_out.set_instrument(6)

last = 0
lastms = 0
stop = True
note_on = False
notes = []
while True:
    if inp.poll():
        # no way to find number of messages in queue
        # so we just specify a high max value
        keystrokes = inp.read(1000)
        print(keystrokes)

        for key in keystrokes:
            if key[0][1] > 43 and key[0][1] < 85 and key[0][0] == M_NOTE_ON:
                last = key[0][1]
                notes.append(key[0][1])
                note_on = True
                if stop:
                    midi_out.note_on(key[0][1], 127)  # 74 is middle C, 127 is "how loud" - max is 127

            if key[0][1] > 43 and key[0][1] < 85 and key[0][0] == M_NOTE_OFF:
                note_on = False
                notes.remove(key[0][1])
                if stop:
                    midi_out.note_off(key[0][1], 127)
            if key[0][1] == M_RIBBON_ON:
                if key[0][2] > 0:
                    # OldRange = (127 - 1)
                    # NewRange = (127 - 60)
                    # NewValue = (((key[0][2] - 1) * NewRange) / OldRange) + 100
                    stop = False

                else:
                    stop = True


    ms = int(time.time() * 10)
    if not stop and len(notes) > 0:
        for note in notes:
            midi_out.note_on(note, 127)  # 74 is middle C, 127 is "how loud" - max is 127

        pygame.time.wait(80)

        for note in notes:
            midi_out.note_off(note, 127)  # 74 is middle C, 127 is "how loud" - max is 127

    # wait 10ms - this is arbitrary, but wait(0) still resulted
    # in 100% cpu utilization
    # pygame.time.wait(10)

Please replace magic numbers like key[0][0] == 144: and key[0][0] == 128: with constants, like

M_NOTE_ON = 144
key[0][0] == M_NOTE_ON:
...

You can do it even by defining these constants in a class/module, but not really needed for such a teeny tiny project.

this was just a small script to fool around but you are right, changed :)