So I have recorded a bass profile and DI (with multiband compression) on a project.
But I want to reamp the bass with another sound now.
PROBLEM IS that the reamped will have a SLIGHT delay, so the phase is not correct.
If I move the reamped track back a bit, how in the world can I possibly know if it's 100% in phase???!?!?!?
I mean, I can move it so it sounds "fuller" but I cannot be 100% sure it's actually perfectly in phase... 
most sequencers allow for sample accurate movement of audio.
pick a characteristic point in the waveform (a nice, quick attack for example) and align this peak with the same peak in the already 'amped' track.
or, flip the phase on one track, move the reamped around until you get the most cancelation (a very thin sound, maybe almost disappearing completely) and flip the phase again.
hth
most sequencers allow for sample accurate movement of audio.
pick a characteristic point in the waveform (a nice, quick attack for example) and align this peak with the same peak in the already 'amped' track.
or, flip the phase on one track, move the reamped around until you get the most cancelation (a very thin sound, maybe almost disappearing completely) and flip the phase again.
hth
Yeah, I know thats what I have been doing but I have no idea when it's 100% in phase
Thanks for the tip about inverting the, I will try that!
Being OCD about this stuff - and not yet trusting my ears - I was facing this exact conundrum while working on my latest song.
What I did was find a place of complete silence in the DI tracks (in the beginning of the song) and draw in a single sample point (like a "tick"), using Logic's file editor with the pencil tool. Actually, I did that in an "empty" region made for that purpose, to ensure I didn't screw up the original tracks - and then just moved that into the DI track where I wanted it.
I then aligned the reamped signal to that - accurate to the sample:
[Blocked Image: https://c1.staticflickr.com/3/2937/33838510980_dc57b36235_o.png]
So where the first edge of the tick is there, that's where I slide the corresponding first edge of the reamped tick to. Also make sure to check whether it sounds fuller with the polarity switched, but it's probably as it should be.
@Michael_dk is that DC offset I see?
@Michael_dk is that DC offset I see?
No, that's just how logic draws it 
you can see it also in the "empty" region - there is no information apart from the pulse (THAT'S the word I've been looking for)
Hmmm, I wonder if this is possible in Cubase...
I think you can - see tip #3 here: https://ask.audio/articles/fiv…o-editing-tips-for-cubase
Otherwise search for "cubase draw waveform" or similar.
Probably worth mentioning that the more drastically the Kemper alters the DI signal via re-amping, the less likely it is that you'll get anywhere-near-enough phase cancellation to approach silence via the null-cancellation trick.
IMHO, Ceddy, Michael's method, in conjunction with the Kemper's Constant-latency feature, should solve the issue for you. Simply instantiate the CL feature on the KPA, re-amp a pulse, take note of the sample offset, doing so at the various buffer settings you run your DAW at, and viola!
Problem solved... for good.
There's a great plugin called Auto Align by a company called Sound Radix. Its great for putting DI's and mic'ed up tracks in phase with one another and can be used across all areas of the mix.
There's a great vid below to show how it works.
