This just popped up on the donnerdeal.com website, better known for retailing a lot of Joyio and Mooer pedals: http://www.donnerdeal.com/promotion/0319/edm.htm It's just for designing the "appearance" of new Donner pedals, not the guts. So probably no way of inducing them to modify pedals so they'd be more appropriate for bass. No comment on whether this is worth doing or not, just putting it out there in case anyone might be interested. Might be fun if you like screwing around with graphics programs. Lot of typos in the posting; I'm pretty sure the contact address is firstname.lastname@example.org, not email@example.com, without th "l".