How is your effects loop NOT an interrupt loop.

It's either an series interrupt loop or it's a buffered loop.  Either can be series or parallel.

Buffered loops use op-amps or tubes to buffer both the send and return signals, and this allows you to add a pot to either to control output/input level.  The Kleinator is is an outboard buffered loop.

That is an interrupt loop, Nik shows a few different loops for different models, but they are all interrupt.  It interrupts the circuit right before the phase inverter to allow you to insert effects.

Buffered loops are definitely more friendly for both pedals and rack gear.  Otherwise it's all a matter of either the gear works at the line-level signal the amp is putting out.

Ultimately....you can install the metro kit and have a SS buffer; se the Klein-uator for an outboard buffer; Weber sells a parts kit with a suggested schematic for a tube-buffer loop; Fuchs has some options; and there are various other kits out there.  There is easily enough room in a 1987x chassis to install something permanent.

On the cheap, I've had success merely using one of these as by FX loop buffer.  They aren't made anymore, but usually go for dirt cheap.  I just nulled out the gate controls.


The Boss LS-2 is the Boss equivalent that should offer the same functionality and allow you a Return level control.

i just think about a idea~
i can use my mixer to do this "buffer" thing??
usually mixer have aux function right?