It depends on what you want to do with the chain, if you want one without the effects to go to a combo and the other chain effected to another combo, that would be a cool thing..

the way you have your signal flow written out in your first post, the preamp would need to be mono…

but…

can you please specify what you mean by ‘preamp’ and what you want it to do.

I’m not sure you want a pre-amp. The way the chain is described, all you need is some kind of stereo pedal, like a chorus maybe, that will go to each combo amp (as the combos already each have a preamp and power amp). Is the goal to send something direct to the P.A.? Those DI boxes you mentioned, I don’t think either is stereo. I know the Sansamp is not.

The Bass Big Muff, Cathedral and SMMH all have dual outputs. I don’t know about the flanger hoax but others do. You seem to have all the tools necessary to do what you’re describing.

Good. Try this:

bass—->bass big muff—->flanger hoax—->cathedral reverb(in stereo, to SMMH)—->stereo memory man with H——>(in stereo to 2 Combo Amps).

Actually I just read that the Flanger Hoax has multiple output options. You’re all set here, and it will probably sound WICKED.

Well again I don’t have the FH, but the picture shows a direct out, effect out, and blended out. If you are in mono you are probably using the blended out. However, with the Cathedral being stereo in, stereo out, you could use the Hoax’s direct out and effect out instead, to both sides of the Cathedral, then the Hazarai, then the amps. Then you would have more control over your sound and the stereo separation you’re looking for.