Have you confirmed with the musical director if you can even use an amp in the pit going forward? Most of the pit gigs I've done have been in-ears only. Direct in through a preamp (sometimes a Sansamp, sometimes a JDI Bass Bone, and sometimes my Trickfish Trilobite preamp) was the name of the game. The few that let me have an amp were pretty demanding that my bass sound wasn't "bassy," so I ended up actually rolling a bit of bass off on my pit amp.