606 bd pitch-sweep mod

[Hess Hodge]

Hello,
I have spent the last week simulating the Waterston 606 mods in Spice.  It
is really cool to be able to run a simulation, export the data to a wav
file and actually hear what the circuit will sound like!  At first I
simulated the unmodified circuit and compared it to the real 606 bd, I
could barely notice a difference!  (If anyone wants to know more about how
to do this, just ask).  The decay and pitch mods have simulated very well
and I am excited to eventually get these implemented in hardware.

Anyway, my problem:  I can't get this pitch-sweep circuit to work.  I know
that the Waterston article has a lot of errors in it, so I have been
experimenting with different resistor values, without any luck.  It has
been a while since I studied transistors, so I figure digging up my books
and actually trying to understand the theory behind the circuit will be my
last resort ;) .  If anyone has any experience with this circuit, would
you please get in touch and tell me what you did to get it to work!

Thanks,
Hess