I tuned the full signal chain including the TPT ladder filter, and I can now play 5-voice polyphony reliably.

On the Raspberry Pi Pico 2, core0 reaches up to ~90% CPU usage at peak settings. This is a great milestone: the filter feels stable and musical while keeping the analog-style topology in a fully digital implementation.

Next step:

• Polyphonic, multitimbral sequencer support (so multiple parts/voices can be sequenced independently)