lfm wrote:One thing to check at least - I had some issues with recording guitar two ways - one lined and one through analog amp.
I got a boxy sound trying to blend these.
In this case there are no timing differences at all between the two sources, just on the resulting recording - so I could just delay one side to make them line up - an boxyness disappeared.
Reason for it all was different propagation delay through A/D-converters. I have a RME card with two analog built in - and then extended with a RME addon card. This was enough to cause different timing two ways. Just 12 samples or something.
Anyway - check that you use the same equipment for both channels - or you can try forever and not get it right.
It seems I can't line them up perfectly because the distance to each mic was different per key. Still trying to find the best setting for sample delay with the least phase cancelling. If you want to try, be my guest, you can download a track with that piano after following the above link