Trouble setting up preamp with digital crossover. Changed from MXR preamp 2 to bgw 200.

Need help! Having a brain freeze.  I am using a BGW preamp, URI digital programable crossover and 4 BGW amps of various sizes.  I can only get sound when I plug the into the EQ or tape inputs.  Then, I can only use the gain on the amps to adjust the volume.  I can even turn off the preamp, and the sound still comes through.  The volume knob on the preamp does nothing.  I know that I am plugging things in wrong, but I have not figured it out though trial and error. Any help would be appreciated.  There are two buttons in the power area that say "power" and "amp".  Never had a preamp that had 2 buttons in this area before.