Hi.

Got myself a Laney GH 100 TI half stack as a trade and I'm trying to use its slave feature, but I have trouble doing it.

Basically what I want to do:

Guitar->engl E 530->Laney slave in for Power amp -> Cab. (that's the simple version, once that works I have something else to do with it.

I have a multi effect in the preamp effects loop and it registers the guitar level. Seems ok up to there.

Had the preamp perfectly working so far plugged in my sound card, only difference is I'm using a mono jack while I used stereo ones.

There is this in the manual:

"If you are using the amp to drive just
one speaker cabinet, connect only one stereo channel via a 1/4" stereo plug. A mono
1/4" plug will short-circuit the poweramp's second channel. If you operate the amp
under these conditions at high volumes for a longer period of time, this may destroy
the amp or other components!"

What do they mean by "just one speaker cab?" I'd try with a stereo cable, the issue is, all the stereo cable I have is very short and not long enough to do the rack->head distance. Could this be the issue ?