Tantalising isn't it.

There actually appears to be at least 2 separate tone control banks. The empeg currently uses bank0 for mp3,AM and AUX, presumably all set to off (as code comments indicate turning tone control 'off'), and bank1 for FM to apply a +6dB bass adjustment.

But, a quick hex-dec conversion of those numbers didn't reveal anything particularly revealing. I'm guessing that they are filter coefficients for an algorithm and not direct f,q,gain values. Maybe an engineering text book would help shed light on them...or maybe not.

Even if we did manage to work this out, we'd have to figure out what to do with the FM tone which currently has the +6dB bass applied (although this isn't insurmountable - we could use an eq for this).

One day.