Bah! I thought I'd tried that after looking at the code. But I guess not. Today it works like a charm.1. Turn Level control all the way down
2. Flip the left model select switch (Terrarium switch 1) four times from it's current position (up/down/up/down, or down/up/down/up)
3. Do the same thing for the right model select switch (Terrarium switch 2)
I've also already tweaked and modded your code into a different beast altogether and I've converted some other json models using convert_json_to_c_header_gru.py from your NeuralSeed project (some good models in there too). I'll try my hand at modeling some of my own amps next. Fun, fun. It's great to have your stuff as a learning tool. Cheers again for open sourcing!