simple schematics

[Roel Das]

I'd like to have some simple noise sources. I'm in this project i which we
have to play a live soundtrack over a very old silent movie ('He who gets
slapped', 1920 or something? I don't remember). I'd like to build some
simple modules to add some random noises in between melodic pieces. They
don't have to be controllable, just very simple. And maybe a very basic
mixer to get them on one channel. I don't have alot of time to build them
(from feb 5 to feb 20).

And i've been playing with an idea. What sound do you get when you use a
pulse to clock a pseudo-random generator (shift register with an exor or
something like that)? And maybe connect this to an up down counter which you
feed on the trigger to get symmetry?

Thanks,
Roel