But it would be interesting to get a 2. Channel with DMA output.
From this as base
https://github.com/krzychb/dac-cosine
I build a Sin Function-Generator which delivers frequencies from 18Hz to 250KHz.
The frequencies from 50Hz to 100KHz (every value you want) could be build with <1% error - tested with scope.
It should be used to test amplifiers and speakers. (Source could be provided, if someone is interested in)
It would be good to get something like that with selfmade waveforms on the second channel.
Maybe someone could build this and show us the resulting code?