yes – as I am sure you know it was a standard design licensed to a number of brands.
I have pictures and names of 5-6 different brand names. Mine is called “MAX” not Jax.
In my oppinoin it has a very unique sound.
Schematcis are impossible to find. But I have suceded in modifying mine with pots for pitch/sustain.
The unused outputs from the Unipulse has minijack outputs on the back of the machine.