What on earth are these...?

[Tony Allgood]

Hi folks,

I bought myself a small second hand rack mounted mixer. I want to hack it
and improve it somewhat, but every channel has a uPC4072HA ic. It is a 9-pin
SIL pack. Anyone know what this is? None of the major UK people have it.

Regards,

Tony Allgood, Cumbria, UK

e-mail: oakley at enterprise.net

Rack mounted Moog VCF module. PCB available. Details to be found at...

http://aupe.phys.andrews.edu/diy_archive/schematics/effects/filter.html