D888 - recording live, mastering songs

[burndaddy]

Greetings Korg forum. This is my first post, I'm a drummer and part-time music recordist. I recently purchased a D888, and although overall I'm very hapy with the flexibility and ease for the price, I have run into a few unexpecteds.

I like being able to master a session on the unit itself. Real sliders and knobs, its portability, etc. However, I can't seem to keep a long session "in the box" when hunting for a tune. I would like to record an hour's worth of material and mix down the best tune, using marks or other editing features for beginning points, without post-D888 editing.

How? Thanks in advance!
- Travis