Thanks for the kind comments.
Yeah, orchestral samples are quite expensive. Let's put it this way, the samples I used are so expensive that I couldn't pay for them, so I'm sure you can figure out how I got them. ;)
Anyway, I use Kontakt 5 (a sampler) which I run as a VST plugin in REAPER (which is a DAW or digital audio workstation). Then I just got a hold of some cool sounding samples to use with Kontakt and I had a friend of mine help me with the "audio mastering" for the Aquatic Ambiance arrangement. The Forest Interlude one are actually just dry samples, which is pretty bad, haha. I hadn't thought about adding reverb etc to make the instruments sound more realistic when I did that arrangement.