How to implement bass and trebble controls?

Does anyone have any ideas on how empeg might have implemented the bass and trebble controls in the original ARM software?

I've had a look in the audio driver code (drivers/char/audio_7212.c) and can't see any ioctl that fits the bill. And, not being a hardware man myself, I can't see anything in any of the chip specs that might do this.

And so I can only guess that they're using software-based audio filters. Any ideas anyone?

Cheers
Paul

I'm sorry this doesn't amount to an answer, but...

I would really like to have this feature in tRio. I have entirely switched from the stock solution to JRec+tRio -- and I love it. I just wanted to let you know there is one more user appreciating your work.

P.S.: I'm interested in helping out in the development if you have any tasks you want to farm out. I code for a living (have done so professionally >10 years), so I think I'm up to whatever would be necessary. I did firmware for a brief stint, so I might be able to help out on the client/HW side.

And so I can only guess that they're using software-based audio filters.

That would be a very good guess. From what I recall, that is in fact how they're doing it.

Hmmm, don't suppose you know of a handy source for such algorithms?

Alas, no. Sorry. Googling doesn't produce results?