This script alternates between sending MIDI notes F1 and D7 periodically. The speed of alternation is controlled by the incoming MIDI CC 01 (modwheel), ranging from approximately 0.8 Hz to 6 Hz. The script also detects the sustain pedal (MIDI CC 64) and sends a single B6 note on when pressed and a single B6 note off when released. The notes are sent with a velocity of 127 on MIDI channel 1.