You get what you pay for. Freeware/Shareware is not the way to go.
You're probably looking for something like <a href="http://www.ableton.com" target=_blank>Ableton</a>.
You might also look at <a href="http://www.synthzone.com" target=_blank>Synthzone.com</a>. They have lists and lists of resources for electronic music. What you're looking for is in the Music and Audio Software forum.
I can't stress enough that you get what you pay for though. I'm not trying to tell you that you should go out and spend thousands of dollars ...
Doug