I appreciate that these units aren't as well made as the Fatar or Roland units, but I'm prepared to accept this because they are cheap!

These are midi pedals; I already have an Alesis nanobass module; or I would use them with my PSR 3k.

I'd love to know why the Fatar and Roland units are so expensive; you can get 88 key weighted keyboard master controllers for not much more outlay!