Anyone done work with DSPs?

I think Matt had done some work in this area but my work has always been in the pure analogue domain.

However I've got a couple of things in the works that might benefit from a DSP. I suspect the Arduino MCUs are too weedy (they're MCUs after all) but I would imagine that the RPi 3 and onward have plenty of horsepower.

But I'm ... you know, into a Force 9 gale at the moment and the option for digital signal processing popped out of some of the current development work so I wonder if any of you folks have any experience in this field. Making a HAT for the PI is about as easy as it gets (thanks to Ebon and those lovely people at the RPi Foundation) but that's where my knowledge comes to an abrupt stop.

I can route the I2S signals almost with my eyes closed but beyond that I'm ... er... stumped.

EDIT: some googling revealed a Fixed Point arithmetic DSP running on the Pi PICO of all things which sounds pretty neat but that sounds more like a tech demo, as clever as it is, than the true floating point math that's usually required.