With the additional tests I made, in order to prepare my gigs, I discovered that Lexicon tends to work better with AIFF Files. Cues (exact position on the track & their colors) and some saved loops are fully transported from Serato to Lexicon and from lexicon to Rekordbox.
I’ll continue to test and transport tracks in order to confirm or not. But my experience shows me the transport of AIFF files seems to perform better than Mp3. With most of MP3 files, I have to set, again, the same cue points in Rekordbox, which represents double work.
This has to do with file compression. Mp3’s are compressed (encoded) and because there are very many different encoders, the beatshift problem occurs. It should not happen often but it depends by what encoder your mp3s were made.
You could always convert your files to AIFF though, then that problem shouldn’t exist.
I have plans to add an audio converter to Lexicon in the future, so converting from MP3 to AIFF (or anything you like) will be an easy and smooth experience.