Do you have a Mac? I used to use a great editor called opFour created by Katsuhiro Chiba. I have a version of it on my computer I can share if you’d like. It was originally created with Max and turned into an app.
Also, in hardware, the Stereoping programmer looks like it solves a lot of problems.
Don’t have my TX81z anymore, but it was a great device with a lot of potential.