These experiments can be run without the EPSI as well, if you want to know if it will work for your needs prior to purchase.

Just re-amp into your DAW with the cab in the 11R disabled, and use an IR loader in your DAW to record. There are some free ones out there I'm pretty sure. The reverb plug-in that is included with Reaper has had the capability for a long time for you to load your own IR (cab model or reverb/room model), so if you have Reaper (which is dirt cheap BTW) you can run this experiment.