I have found 4 of 30 boards that have a manufacturer error. If you bought a BMP board from me labeled "Little Miss Muffet" and are only getting bypass signal, lug 2 of the volume/level pot is grounded. You need to disconnect the middle leg of the pot from the board completely and wire it directly to the "Output" on you 3PDT. Shoot me a PM if this doesn't make sense and I'll walk you through it. Sorry if this affects anyone.
Not that I bought a board, but this is what I always do when I notice that the volume out goes straight to output. The less wiring the better.