The currently supported radices are 2, 3, 4, and 8. Small primes 5 and 7 should be added for parity with other FFT libraries. Larger powers of two might be desirable for performance.

First, say nice work.

Is this a good app to use on document forging check? (id cards etc)

If so what would be the optimal settings for this use case?

It's confusing for 6 to mean triangle. Allow symbols to be defined using either name or number.

I simple example showing how to use some of the effects and filters with Dplug would be great to have.

Something like a two-band splitter/summer with compression would be nice.