Define "affordable". Also, unclear as to whether you're going to run
it to a second amp? It's not labeled as a looper/mixer, but the
Voodoo Labs Amp Selector will do the trick (plus some). You can
adjust the mix of each path (guitar/shimmer) individually at the
pedal. Plus, it'll give you much more options if you want to add
additional amps later on. I've got one and love it. Great quality,
too. Used, you can find them for 135-150.00 USD.