I have read the manual and I don't see a way to do this but I thought I would ask. I want to know if it is possible to run an outboard preamp through the power amp section of the DB-750. I don't see a need for this 99% of the time as the 750 has great tone but I would like to sell my extra power amp since I would rarely use it if the Aguilar can do it. Anyone done this before? Thanks for any info in advance!