This is based (for Mac) on the User Interface Soundloom. There are lots of resources for Composers including tutorials, demo sounds, manuals for PC and Mac. The software gives a lot of options for processing, file handling, sample rates etc.
The composition I am embarking on will be mainly sound (with some light instrumentation).
There are lots of other possibilities including using various DAWS and effects, MAX/MSP, or CLM (capable of higher quality sound). If anyone has comments on the pros and cons of all of these for high quality audio it would interesting to hear.