+1. And it that's not the problem, it's almost always Yek's second suggestion: Check to see if one of the blocks is attached to an expression pedal. If it is, and you don't have an identical controller set up, you'll usually get no volume. For instance, if output volume is tied to pedal External 1, and you don't actually have an External 1 pedal set up, the output volume will be zero.Just like Yek said, check the cab to see if it's set to a user cabinet. 99% of the time that's the problem.
Go into the Edit pages in each block and look for parameters that are tied to external controllers. If the user cabs aren't an issue, external controller assignments are the most likely suspects.I've replaced his cabs with my own usercabs, all of which are filled with Ownhammer cabs. Still no sound.