How to add DSP to Audible Illusions Pre

I have a 2 channel DSP that I have purchased used, but never hooked up.
I am considering trying this out, but what is the normal method for that?


There is a “Source”/“Tape” switch on the left hand side of the preamp.
Do I just output the line level via the “Tape In” —> DSP —> “Tape Out”


Which reminds me I should do an REW sweep pretty soon, to get an idea as to why I should consider doing this. (Probably before I actually start doing it)