thanks for the advice, guys. i've been searching around for Amiga samplers and midi interfaces, and would certainly be interested in what you've got there. i've got a bit of software on disk already, and would love to transfer over all the stuff i've downloaded in my searches. i'll be posting a lengthy thread in the hardware help form with all the questions i've gathered for the 500, 1200, and Amigas in general.
Bars & Pipes seems great, that's one that i'm looking forward to. still haven't made much sense of trackers yet (i'm used to things like Cubase and Ableton Live), but have a copy of Noisetracker with manual on the way so that might help. i used to have Dr. T's KCS for the Atari, but haven't found it available anywhere (to buy or even download). actually, maybe it's possible to still get it through him? i'll look around a bit more. right now i'm pretty much looking for anything music/audio-related to the A500 or A1200. plenty excited, spent a few hours tonight going through a pile of 200 old DD floppies full of junk. found some really useful utilities in there though that i'll have to take a closer look at.