Dr R wrote: ↑Tue Jan 18, 2022 7:21 am Hi Matthovani_music,
This is a ridiculously late reply to your post, but there's an off-chance you may read it and it may help.
Try the forums at Basschat.co.uk. There is a huge amount of tech knowledge there, and while I doubt many have seen a Sinsonido (other than a few who have played mine at a meet-up), there will be lots of knowledge on piezo pickups. I am more active there than here in the last couple of years, so if you do wander over I'll say hello.
How are you getting on with that these days?
Getting enough practice to improve?