The TS10/12 can only edit samples and save them only as "sample edits" meaning, after you have edited a sample and you go to re-load, you have to load the original sample and then load your sample edits as the TS will not copy the original sample. From what I remember, you do have access to every EPS and ASR10 parameter for editing.
The max sample ram is 8 megs using two 4x8 30 pin SIMMs. I hope this helps some.