channel = 0
keymap = [
    { key = 'KeyW', note = 59 },       # B
    { key = 'UpArrow', note = 60 },    # C
    { key = 'DownArrow', note = 62 },  # D
    { key = 'LeftArrow', note = 64 },  # E
    { key = 'RightArrow', note = 65 }, # F
    { key = 'Space', note = 67 },      # G
    { key = 'KeyM', note = 69 },       # A
]