Yamaha Digital Piano MIDI Monitor in Python

pip3 install mido python-rtmidi

#!/usr/bin/env python3
"""Simple MIDI monitor - prints incoming MIDI messages to console."""

import mido

def list_ports():
    """List available MIDI input ports."""
    ports = mido.get_input_names()
    if not ports:
        print("No MIDI input ports found.")
        return None

    print("Available MIDI input ports:")
    for i, port in enumerate(ports):
        print(f"  [{i}] {port}")
    return ports

def monitor_midi(port_name=None):
    """Monitor MIDI input and print messages."""
    ports = list_ports()
    if not ports:
        print("\nPlug in your MIDI device and try again.")
        return

    # Auto-select Yamaha if found, otherwise use first port or specified
    if port_name is None:
        yamaha_ports = [p for p in ports if 'yamaha' in p.lower() or 'digital piano' in p.lower()]
        if yamaha_ports:
            port_name = yamaha_ports[0]
        else:
            port_name = ports[0]

    print(f"\nOpening: {port_name}")
    print("Listening for MIDI messages... (Ctrl+C to quit)\n")

    try:
        with mido.open_input(port_name) as inport:
            for msg in inport:
                print(msg)
    except KeyboardInterrupt:
        print("\nStopped.")
    except Exception as e:
        print(f"Error: {e}")

if __name__ == "__main__":
    import sys
    port = sys.argv[1] if len(sys.argv) > 1 else None
    monitor_midi(port)

python3 midi_monitor.py

python3 midi_monitor.py "Digital Piano"

#!/usr/bin/env python3
"""MIDI monitor with 2-second echo at half intensity."""

import mido
import threading
import time

def list_ports():
    """List available MIDI input ports."""
    ports = mido.get_input_names()
    if not ports:
        print("No MIDI input ports found.")
        return None

    print("Available MIDI input ports:")
    for i, port in enumerate(ports):
        print(f"  [{i}] {port}")
    return ports

def delayed_send(outport, msg, delay):
    """Send a message after a delay."""
    time.sleep(delay)
    outport.send(msg)
    print(f"  -> echo: {msg}")

def monitor_midi(port_name=None):
    """Monitor MIDI input, print messages, and echo notes with 2s delay at half velocity."""
    ports = list_ports()
    if not ports:
        print("\nPlug in your MIDI device and try again.")
        return

    # Auto-select Yamaha if found, otherwise use first port or specified
    if port_name is None:
        yamaha_ports = [p for p in ports if 'yamaha' in p.lower() or 'digital piano' in p.lower()]
        if yamaha_ports:
            port_name = yamaha_ports[0]
        else:
            port_name = ports[0]

    print(f"\nOpening: {port_name}")
    print("Listening for MIDI messages... (Ctrl+C to quit)")
    print("Notes will echo back after 2s at half velocity.\n")

    try:
        with mido.open_input(port_name) as inport, mido.open_output(port_name) as outport:
            for msg in inport:
                print(f"recv: {msg}")

                # Echo note_on and note_off events
                if msg.type in ('note_on', 'note_off'):
                    # Create echo message with half velocity
                    echo_msg = msg.copy(velocity=msg.velocity // 2)

                    # Schedule delayed send in background thread
                    t = threading.Thread(target=delayed_send, args=(outport, echo_msg, 2.0))
                    t.daemon = True
                    t.start()

    except KeyboardInterrupt:
        print("\nStopped.")
    except Exception as e:
        print(f"Error: {e}")

if __name__ == "__main__":
    import sys
    port = sys.argv[1] if len(sys.argv) > 1 else None
    monitor_midi(port)

lsusb | grep -i yamaha
# Bus 001 Device 013: ID 0499:1718 Yamaha Corp. Digital Piano