When you don’t want to take your hands off the keyboard, a foot-pedal switch is a real convenience.
Overall, this pedal is much cheaper than the high-end pedals mentioned above. The total cost came to around $37, because I had some of the parts on hand. Further, you can upload new code to the Teensy on all operating systems, a big win over the Windows-only pedals above.
However, this pedal only has one foot switch. You could easily add more M-Audio sustain pedals to the design, and keep adding 1/4” jacks to a project box. The Teensy has plenty more IO lines to use! Or you could go for it all in one enclosure with the guitar pedal hardware.