Hi!
I have the pro edition, but the method probably is the same. I've attached two quick mini "videos" showing how to export a complete mixdown and seps.
Since Studio One supports FLAC, you don't need any external tool (FLAC is more or less equal to APE in terms of compressed size, and it is much more widely accepted than APE - although we usually don't have any problems with APE here at MCS).
Regards,
Steffen