if you need to make phase adjustments, is there another track your trying to blend it with? the original miced tracked, and your re-amping the di from the same performance?
ummm. its a bass? use a very very high pitched click as the reference
unfortunatly you prolly should have corrected the phase durring tracking using the IBP as the Di box and aplying phase then. just for simplicity, and you could have gone about your normal reamping method. but this is still normal
But if you put the very very high pitched click on the DI track, BEFORE you reamp it, it should be fine when you line it up. I dont think the adjustments you are going to be making are going to really make a huge difference (in my scenario w/ a very high frequency click sound, and a bass as the track being adjusted into phase). line it back up and listen.
I love the friggen IBP. Let us know what happens whatever you do