Doepfer

the 4012 was a transistor ladder "moog" filter and doepfer already has 
that (A-120) so go for the 24db (cascade of integrators) 4072 or 4075 
(these two are almost identical)

/A


> The 4012 was probably the best known.  Other ARP classic VCFs are 
the 
> 4035 and 4072/4075.  There's schematics and info at:
> http://www.till.com/arptech/modmain.htm