roland sh-3a question

[Peri Pakroo]

I'm working on a friend's sh-3A, and have most of it working, except the
vco output. I have a schematic from Roland, and I can trace the key
voltage to the output of an op amp on the vco board, configured as a unity
gain voltage follower. After that, I get lost. There is a matched
transistor pair that gets the cv, which can be altered by adjusting the
vco width and frequency pots or plugging in a vco pedal control. This pair
eventually feeds a small board plugged into the vco board, and it is my
guess that its output is a pulse that drives the LM3216 chip--the latter
looks like an analog frequency divider that sends the 4', 8', 16' and 32'
octaves to the vco octave sliders. 

I'm not well-versed in discrete circuitry, so I'm not sure which
components comprise the actual oscillator at this stage of the vco board.
Can anyone with a knowledge of the sh-3 circuitry help me trace through
this stage?  BTW, I called National Semi and Sanyo, but they don't even
show the LM3216 as a discontinued chip. I thought knowing the specs for
the input to this chip would help me trace the vco circuitry preceding it.
Is there any source of info on this chip, and possibly a supplier for a
replacement in case I need to try a new one?