Hi Simon

> But no signal at Pin 3 (output) of the 2044 - totally dead - with the
> controls set right. [...]
> Seems like the silence at 2044 pin 3 points to a dead filter chip, do
> you think

Now, still there is a little hope for the 2044. Check the voltage at pin
15 (offset) and pin 13. If it would be -15 Volts, then the VCF would
shut down completely and no other CV would help.

But in fact I fear a dead 2044 too.

> There are some 2044's on ebay, though some of the other numbers on the
> top are different. Do you think that matters

No. Single SSMs are available from Senso ( http://www.vintageplanet.nl/)
for around 17 Euros. The seller "technologytransplant" on ebay sells
good ones as sixpack for 55 Euros!

Florian