Notes from the bench: got all the dspod interfaces working and the primary audio effects application is working. Porting to ESP32P4 *and* upgrading to ESP-IDF V6.x required some changes to the way I handle the audio and CV DMA, but that's done and things are working.
The dspod_stampp4 project is fully fleshed out and has been posted to Github here:
https://github.com/emeb/dspod/tree/main/dspod_stampp4
You can find hardware and firmware details at that site.
Overall, I don't think that the ESP32P4 provides significant improvement over the ESP32S3 for audio DSP applications - the faster CPU clock rate is not a huge advantage and the other multimedia interfaces and coprocessors were not useful in my application. It's fun to try, but not a significant leap ahead.