Once again The Trident!

[Grant Richter]

The EML 101 also used the exponential V-V followed by linear VCOs. There 
were two V-V expo converters based on the uA726. One for the oscillators and
one for the filter.

The Moog oscillators that used a common expo converter for multiple
oscillators, was that voltage or current?

You could also do the same trick with an expo current source. Drive linear
CCOs from one expo converter using a resistor splitter and offset one CCO
from the other by injecting additional current at pin 5 of a 3080.

Conversely, take the standard expo pair, normally one base is grounded and
the 18 mv signal is injected at the other base. To make a multiple source,
you string together matched trannies each with it's base grounded. They will
all track the common input (from the emitters).

What I did was add 56K/1K attenuators to each additional base input. You can
now offset each one of them with a voltage, but they will still track the
common emitter input at 1v/octave. This works good for multi section filters
(like 8 parallel bandpass). I don't know if tracking will be accurate enough
for multiple CCO cores.

This would be the start of a harmonic generator though. Offset each current
source by a multiple. Then each CCO would run at 1x, 2x, 3x etc. and
"should" track a common 1v/oct input. HF compensation would have to be the
De Franco type as each trannie is running on a different slope of the Rbe
error curve.