Delay compensation with outboard gear

[pkcraft]

Hi, I'm trying to use delay compensation to adjust for
latency when sending to outboard gear.

I've recorded the return from the outboard gear (gear in bypass mode)
and measured the latency as 120 samples.

If I introduce an aux input track, set the input to the return from
the outboard gear, and set the user offset to 120 samples, it appears
to double the latency to 240. If I set it to -120 samples, the
latency remains at 120. (I've determined this by panning the
original track hard left and the aux input track hard right and
routing outputs 1 and 2 back to another track and recording/analyzing
it.)

As far as I can tell, a negative number is equivalent to setting
delay compensation to zero.

Has anyone seen this? Can someone tell me what I'm doing wrong?

Thanks!

[pkcraft]

Ugh. Ok, I'm new to TDM and I've just discovered the wonderful
world of hardware inserts.

Next time I'll RTFM before posting. Sorry.