trying to play with rectification

[birt]

Hey i found an online circuit simulator (on www.falstad.com) since i can't find any other circuit sim for Mac. i was thinking what it would sound like to rectify some frequencies from a guitar signal and put them back together with the original signal, perhaps with some delay or phase shift.
So i began with a high pass filter, added a fullwave rectifier, and then added more ac sources with abunch of diodes at different places in the circuit playing with halfwave rectification and so on. until i found i could make lots of weird wave shapes this way.

now i wanted to see what this would do to sound (guitar for example, not just sine waves like i was using) but i can't find any "random" a/c generator in that circuit sim, only pure sine, block, triangle or saw tooth. any help?