I second the recommendation of Audacity. You might also want to grab Fruityloops (or FL Studio as it is now called;) besides being a good entry-level music creation tool, it has all kinds of funky electronic noises.
How to create sound effects?
Miscellaneous Forums/Content Creation Tools/How to create sound effects?The forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.