i do not remember if i have tried that, (back when i had an MS20),  but the A165 should convert between the inverse triggers outs of the ms20 and the gate inputs of the a100...
 right
 (as the A165 is a voltage inverter and offset gen in order to invert gates/triggers)
  
 apart from its +/- function too...
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 --- On Sat, 7/12/08, andrew dalio <bunnyman@...> wrote:
 From: andrew dalio <bunnyman@...>
 Subject: 1 Re: Korg MS20 to control doepfer synths
 To: Doepfer_a100@yahoogroups.com
 Date: Saturday, July 12, 2008, 5:23 PM
 The Hz/Oct to V/Oct VCA trick is pretty interesting. I'll have to try
 it! But one thing that hasn't been addressed yet: the MS-20 has an
 S-Trigger (ala Moog, it shorts to ground), while the A-100 is Gate.
 Has anyone made a trigger to gate converter
 Unfortunately, it's a LOT easier to control your MS-20 with
 exponential gear. Use the external signal processor to convert the
 gate to a trigger; plug the pitch CV into the "total" jack insted of
 the KBD CV in, bias with the pitch wheel, and you're set! Check this
 page for great MS-20 tips:
 http://www.korganal ogue.net/ korgms/mstt. html
 -drew
 --- In Doepfer_a100@ yahoogroups. com, "Carlos" <bushwick@.. .> wrote:
 >
 > Elby Designs is working on a nice eurorack hz/volt to volt/oct and the
 > other way around convertor so you can interface your ms-20 and other
 > hz/volt gear with your doepfer system anyway you want:
 >
 > http://elby- designs.com/ panther/ed102- octave-volts- hertz/ed102- panel.pdf
 >
 >
 > give them an email, I think they are ready to get it going, they jsut
 > need a little push :)
 >
 > I have an ms-20 too so really hoping they finish it soon.
 > C.
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