If memnorty serves me well that SX 880 has a tape monitor switch, no?
Let's hope so 'cause that's critical to this.
Take a stereo interconnect and send it from the receiver's "tape out" to the processor's input.
Take another stereo interconnect and send it from the processor's output back to the receiver's "tape in".
Now, to use the processor, simply press the "tape monitor" button on your receiver.
Use the same process to connect the reverb to the processor.
Take a stereo interconnect and send it from the processors "tape out" to the reverb's input.
Now, to use the reverb, simply press the "tape monitor" button on your processor.
So, to use all three, press the tape monotor on the receiver and then press the tape monitor on the processor. It doesn't matter which one is hooked up first.
But, if that receiver has two tape momitors, you can hook up one to each one.
You can hook up either one first or second, but to use thesecond unit, you'll have to
Take another stereo interconnect and send it from the reverb's output back to the processor's "tape in".