I have to admit, I don't know much about this composer, which is embarrassing. After reading this New York Times obituary, I hope that this online archive will provide more information. (You can subscribe to it via RSS feed.) If anyone knows of any websites or YouTube videos about Amacher, please let me know.
Speaking of electronic music, my professor told me today that now there is a stand-alone version of RTcmix. (I mean, you could always use command-line RTcmix, but for some reason I am really dense as to how to talk to it using the console.) I'm not sure if I should give away the link...