Well it seems the loudness may not be affected by the bass and treble after all. However the FM bass boost will but I don't see that being much of issue with peope.

I'm having a few minor issues with calculating some of the DSP coefficients but once I sort that out we should be good to go.

As for affecting the slope and cutoff of the loudness, that's probably a separate project.

Also what kind of frequency points are we looking at here? Examples in the manual are 125Hz and 5kHz. Since it basically needs to be pre-calced, we can't have a variable frequency unfortunately. -6db to +6db enough? I only have 4 bits each to play with using genixias code, although Mark said he would give more bits once bass and treble were done properly.