[sdiy] Noise-generating ICs

[Robotboy8 at aol.com]

Hi, I think this is my first post but I've been lurking for months now.
I'm looking to build an electronic drumset using a noise source split into 
several identical channels, filtered, and mixed back together.  The trouble is, 
the book I'm getting the basics out of (Build your Own Low-Cost Signal 
Generator, by Delton T. Horn) lists two ICs for noise generation, the MM5837N and the 
S2688, but a Googling shows that neither are easily available.  Can anyone 
here point me towards another suitable IC?
As background, I'm building a simple drum machine as a first sdiy project 
(not very synth, i guess, but a good start).  I haven't purchased many components 
yet because I want to make sure they're all available - so far, that's the 
only one that's not.
Also, are there any reasonable alternatives to optoisolators for 
voltage-controlled resistors?  How is voltage control usually handled in synths? (this 
one's been bugging me for a looong time...)
       -eric
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