I am having a problem with my motu 828 my level volume and main volume knobs doesn't seem to control the volume of my monitor output (outs 1-2) what ever I do, turn it way up or way down they have absolutely no effect on monitors output (outs 1-2) but when I plug a headphone in the headphone jack the level volume and main volume knob are controling the volume of my headphones but not the monitor outs.

I have read an article in the motu website on how to configure the level volume and main volume knobs to control only the heaphone or monitor outputs by opening the motu 828 and simply switching a wire, I have searched for this article again and I couldn't find it anymore.

I bought my motu 828 second hand and it is very likely that the previous owner has done this modification to the motu 828 anyone out there know how to undo this??

or is my guess of the source of the problem entirely wrong? if so what causing it?

When pluging in your headphones into 828, th main knob controls the volume of the the whole mix, say any audio-tracks you've already recorded.
That is you're listening basically to channels 1-2. At the same time you can set 828 listen at channels 5-6 inputs, where you'll add a stereo guitar
or whatever. ( this is done in the firewire console app ).
The volume of input-channels 5-6 in 828 is controlled by level/monitor level knob.

Cheers: Dixiechicken

I figured it out. I'm posting how I solved it cause it might be useful for other motu 828 users to know this feature.

After loosing all hope, i just took the risk and opened up my motu 828, turns out in the circuit board there is a switch where you can remove a jumper to either variable or fixed position. Variable - you can control the monitor outs with the volume knobs, fixed - you cannot control them with the knobs but the knobs control the headphone out(this feature is useful when using the motu 828 for live applications so you can independently monitor the volume for the headphones and not affect the monitor outs).