The CT is Boogie's take on what a 50's Fender Tweed with a 1 X 12 could have been with today's technology added to a classic circuit and tube compliment. Mesa used to make their effects loops at least 10% parallel. In other words, at least 10% of the combo's preamp sound was purposely mixed back into the return's path. That made it impossible to properly use a Synergy preamp with a Boogie, unless the loop was modified to become fully serial. It was Boogie's amp designers contention that some of the 'dry' preamp sound was necessary to maintain the tone of the amp through the loop. Recently, however, Mesa has gone to a pure serial loop design. So the California Tweed should work fine with a Syn-1 or Syn-2 in the loop. I have a very early '68 Fender Bandmaster (AB763 Black Face preamp). I have agonized over whether to get the amp modified by adding a Metropoulos serial loop so I could use it with a Syn-2. My agony has ended now that the Cali Tweed has been released. I plan to sell the Bandmaster, and replace it with the Cali Tweed. With the 4 6V6 tubes in A/B Pentode mode, the amp should have almost as much headroom as my Bandmaster (6L6 tubes). The other power modes will cover all of my needs when adding in the Syn-2 to the mix. My long term studio plan includes a Syn-2 with 4 modules; a T/DLX, a Morgan AC, a Plexi, and a BE-BB. BTW, I will be using the Syn-2s with a Koch "The Greg" and a Mesa 5:25 Express Plus as well.