[quote name='Greg Edwards69' timestamp='1404942494' post='2497279']
Yes, with a mono cable in the fx loop it behaves as return only, so can be used as a secondary input. But as stated above, you'll have little control over the mix.
FWIW, I leave the EBS pedal on all the time with an ABY pedal in the dirty loop. This way I can take advantage of the built in compression and anything in the clean loop, then kick the drive side in when needed with the ABY pedal.
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The great man himself does something similar I believe. He also uses a Roles crossover in his dirty loop to return only 250-300hz and upwards from the dirty loop, also has another sig pedal in his CLEAN loop (chicken and egg?) to make it a little dirty too. More in this video:
The Winery Dogs walk us through their live gear: http://youtu.be/h4Vm0K4IVw4