I'm beyond happy that Stems now works with Lossless audio!
All you have to do is convert your WAV or AIFF to ALAC, then import the ALAC files into the stem creator tool... and boom. You now get a STEMS file of uncompressed audio!!
I've been waiting for this for years!!
It's easy enough as well to do mastering for stems.
Separate you track into 4 parts and apply whatever is needed on each part (not a lot, EQ, some widening, color eq, maybe some dynamic eq)...
Then, on the master channel put some compression and limiting.
On the stem creator tool BYPASS the compression and limiting there (they don't sound that good).. and then after traktor with a routing audio software like Audio Hijack, put a final limiter that will work when you play live.
So happy now with this setup!!
Thanks Native for making this work finally <3