Fishman Tone AFX DEQ

I have an acoustic guitar without preamp and that device solved my problem. It preserves the natural tone of the instrument. When I first plugged it, I really enjoyed the sound. Also the effects sound great and give the player total control of his wet sound.
On the other hand, I was dissapointed that I didn't find mentioned anywhere that when using the xlr output, you cannot control the volume of the preamp. I should have read it in the manual before purchasing. Also deciding between effects and choosing them when playing live is a little tricky.