as of now i use a (legally) free program called
Mad Tracker... you could also see if there are any free trial programs of drum machines or what-not so you can get different files to use in the program, you can look around at someplace like
download.com (you can look elsewhere on google or something) and find different sound effects... that madtracker place also has free VST plug-ins and such as well. Be sure to read the manual for the madtracker program because if you just open it up and try to use it, you'll be lost haha I was... was that helpful? Need more information?