Signal gets extra 6dB of gain between audio track and aux track

Ok, here's a weird one. I have a guitar track that is one of two routed into an aux track acting as a subgroup, and that aux track then goes into a bus. What I'm seeing is the output of the aux track is 6dB higher than the output of the guitar track going into it. This is still the case when the track is soloed so it's not some other track feeding in as well, and there are no other sends from the guitar track. The aux track's gain and volume are both 0. No plugins on the aux track, no ProChannel.
 
I fixed the problem by just creating a fresh aux track and routing the guitars through there instead. I can't see any difference between the new one and the old one but now I get unity gain when I pipe audio through. So, I don't really have a problem that needs solving any more, but I thought this was worth mentioning. Maybe someone else can reproduce it, or maybe someone knows a hidden setting that I accidentally managed to switch. 6dB is a suspiciously 'round' number, as if the signal was being routed in twice by accident.

Good idea, but both aux tracks (the boosted one, and the normal one) have stereo inputs and are marked as stereo interleave. Also the guitar tracks are hard panned.

Said in first post, "The aux track's gain and volume are both 0". As far as I can tell the old broken aux track and the new one are identical in every way and in every setting. That's what makes this quite weird.

Nothing really useful there, unfortunately. A lot of talk about meters and offset mode, and my meters aren't the issue and offset mode shows no offsets for me.

Not gonna apply, is it?

Can you share a stripped down version of the project that does this?

Both the bus aux inputs in my case are stereo. And the difference is 6dB rather than 3.
 

Kylotan
As for sharing a stripped down version of the project, I might be able to, but that's a lower priority than trying to get Sonar to freeze a synth without crashing, which is currently occupying my time.

If you are having problems with a particular synth, try using a patchpoint to record the synth as audio rather than freeze. I had to do that when I ran into a problem with a synth.
 
Dan
 

Another 'fun' bug encountered during experimenting with this - toggle the stereo interleave option of a track in the Inspector and the channel strip of its output next to it disappears and is replaced with a main out. *slow clap*