Analogue Systems makes RS170 dual 5-way multiple. From the manual:
"If you simply wish to sum the signals, you can use the
RS170 as a pair of passive 4-channel mixers with unity gain."

I was under the impression, that it is similar to A-180...

Best regards
Jari Jokinen

> In principle an A-180 cannot do this job as you never should short

outputs

> (but that's what you do if you connect the CV out of an A-190 and A-

155). In

> the A-100 nothing can be damaged by shortening outputs but it's a

basic

> principle not to do that.
> For your application you need a mixer/adder. But the VCOs also have

a second

> CV input available for this application (one via bus from the A-190

and one

> in front from the A-155).