Those are nice, Shari.
Oh, and before I forget... WOOHOO! Four-Hundreth post!
OK, anyways...
Coldstone will play Quicktime-readable files. This means that if you can drag and drop it on Quicktime player to play, Coldstone should be able to play it too. This includes MP3, MP2, AIFF, AIFC, etc.
for Cheap MIDI with a built-in sampler, check out Melody Assistant ( (url="http://"http://www.myriad-online.com/melody.htm")http://www.myriad-on....com/melody.htm(/url) ). It's $15 bucks and you get a really good bang for your buck. Its bigger brother Harmony Assistant has some neat features too.
If you're going to go the loop route (I, personally, find this to be utterly lacking in craft, but whatever), then you should know that there is no Mac version of Acid (and it is precisely for this reason that it is not endorsed by Nine Inch Nails...), but there is an equivalent: Phrazer by Bitheadz ( (url="http://"http://www.bitheadz.com")http://www.bitheadz.com(/url) ). It pretty much does everything Acid does, including reading/writing ACID-formatted files. It's a couple-hundred bucks, tho.
Anyone who wants a free digital 8-track recorder should check out Pro Tools Free ( (url="http://"http://www.digidesign.com")http://www.digidesign.com(/url) ). Pro Tools is good stuff, and the limited version can still do quite a bit. You should also keep in mind that the Beatles made Sgt. Pepper's Lonely Hearts Club Band on two four-tracks, which is just as limiting. I know that Beck and Nine Inch Nails swear by the more fully-featured versions.
My multi-tracking MIDI/Audio program of choice is Logic Audio ( (url="http://"http://www.emagic.de")http://www.emagic.de(/url) ). While Pro Tools is geared towards recording studios, Logic is geared towards artists. I know that Radiohead and Jamaraquoi use Logic.
I've used Cubase ( (url="http://"http://www.steinberg.net")http://www.steinberg.net(/url) ) a little, but in my experience it's a buggy piece of crap with a poor user-interface.
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People who claim the sky is falling obviously aren't aware the earth is falling, too.
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"Those who would give up essential liberty, to purchase a little temporary safety, deserve neither liberty nor safety" --Benjamin Franklin.