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Topics - Voidoid


I'm a newbie both to the forum and DIY electronics. I hope this type of thing is alright to ask - if not, let me know!

I'm trying to DIY some stuff related to a Roland Super Cube 100 from the '80s. I'm stuck figuring out the FX loop (or rather "Stack jacks") on this amp. With my present knowledge the schematic is a bit above my head. If someone could help me figure this out it would help out a great deal.

I found the service manual online as a pdf on another forum (in post #12):
It wasn't the easiest thing to come by! It has a schematic on page 4 of the manual, with the stack jacks in the upper right corner (top of JK-2 board).

The user manual (separate document) talks briefly about parallell wiring. This pair of jacks is really intended to string several Super Cubes together (hence "Stack jacks" moniker). The Pre Out/Main In secondary labelling sure suggests it, but is this even usable as an FX loop? I got a noticable volume boost plugging in that way compared to just going to the top panel. I'd reeeally like to know how it works.