Hi, I'm trying to program bass and treble controls for a Yamaha 3050 AVR, I found a load of resources for Yamaha but they all have bass and treble discrete codes for zone 2 and zone 3 but never for the main zone.

I even rummaged through a control4 driver but that notes in the comments that discrete codes for tone controls are missing.

I've been through the whole Yamaha PDF codes library in case there's something in an old amplifier that documents it (and they didn't change it) but nothing I can find.

I've tried a few made up codes, looking for patterns but nothing useful yet, I don't think I understood the codes enough to know which ones are worth trying.

I find it hard to believe that Yamaha implemented discrete codes for the secondary zones and not for the main, they have to be in there surely?

So can anyone that understands the Yamaha scheme suggest what to try please? I have a URC6440 so I can try anything in the usual yamaha scheme.

I know tone controls are out of fashion but I think they have a lot of value.

Any hints or help gratefully received.