These are the Melo Audio Midi Controller and EXP-001 that allows you to switch guitar tones, effects; and control them with the expression pedal. The MIDI Commander comes pre-configured to work with other units like: Bias Fx, Axe Fx, Kemper and many other software. Amazon affiliated links: - Melo Audio Midi Commander: https://amzn.to/3bneOlX - Melo Audio EXP-001: https://amzn.to/2U6exfz Melo Audio official website: https://meloaudio.com/