is it out there?

[burzy ming]

im new to the diy synth world. heck im new to the synth world!.  ive
been doing some experimenting with a couple of those 130 / 75 / whatever
in 1 experimenters kits from radio shack.  primitive but helpful (a buck
a piece at goodwill, with all the parts!).  my question is...is there
something like that in the software world?  a program that would let you
pick from a list of potential parts (transistors, capacitors, etc) and
connect them as you like and hear the resultant sound etc, all with a
graphic interface (like sega's pinball video game for the genesis) (was
that to obtuse?) HELP!  this would be a great way to test out circuits
before doing all the soldering.
if you know of any such thing please inform me, im lousy with a
soldering iron.
thanks - mark    burzy at mindspring.com