Thanks for the reply, Taylor. Your 8-string bass is pretty cool! I’m sure it sounds great in your hands and completely throws off anyone trying it for the first time.These days, I have 2 basses. One is a really weird 8-string bass with quartertone frets and other unusual features.
But since that's not very representative of what anybody else is playing, the bass I actually use to test pedals while designing is a passive Fender with a P pickup and a bridge J pickup, which I have strung BEAD. I figure that's a pretty middle-of-the-road instrument in terms of output level and frequency content, and lets me check how things work on a low B. I try things out with the 8-string too just to check with active electronics.
Once a design is pretty much all there, I have a small group of beta testers to test things out with their various instruments and playing styles. Everybody seems to have different setup and technique, which translates to different dynamics, so sometimes things need to be re-tuned based on that feedback.
Most IE pedal users are bassists, but I do also test them all with guitars before finalizing. It can be tricky to tune things like the envelope sensitivity to work with single coil guitar pickups on high strings while simultaneously keeping the range of the knob from being too tweaky on basses.
The BEAD PJ sounds like a good compromise to use for testing the pedals as well as using a few beta testers. Being a passive bass I’m guessing the output isn’t too hot. I’ve been having much better response with effects pedals with my active basses by putting the internal preamp trim volume close to the passive volume. Seems to allow for the greatest dynamic range. Anyway, thanks for sharing and creating the IE pedals. The XD is a thing of beauty and figuring out the top row relationships has been fun. Cheers!