200e

Yes, you definitely have a bit of a conundrum. I believe in one of the NAMM interviews there was mention of a forthcoming Buchla keyboard or at least an often repeated rumor about one though there are no details or price point. I suspect it may be special in terms of innovative features and hence not inexpensive.

I myself have a 225e so I'm sort of plug and play with MIDI barring any OS bugs

Basically no one has made a native CV keyboard in about 30 years with piano style keys (I'm saying that because I don't mean a touch plate "keyboard" like the still in production Serge TKB). There are keyboards on the market that put out a CV but all of them are actually MIDI keyboards with an internal MIDI to CV converter. The new Akai MAX49 is an example but this includes the modular specialty keyboards too. I'm just mentioning that because an external MIDI to CV converter added to someone's choice of MIDI keyboard may be a better package. That's especially true to get the needed 1.2v/octave because what's on the market is geared to 1.0v/oct users and the external converters are more likely to have a 1.2v range.

I can think of 3 ways to get 1.2v/oct. Firstly is you just have a MIDI to CV converter that does it via calibration. You definitely want to research that before you buy. 

The second option is you run your 1.0v/oct CV into two inputs on a module that mixes DC voltage. I've not tried the 210e but it might work (or might be too course). I'm pretty sure the Verbos 254 will work. The concept is one muinput is set to 100% out and the other takes in the same CV again but is set to about 20% and adjusted to track with the input pot.

The third option as someone mentioned is Silent Way or Volta software. MOTU Volta was out first. It's Mac only which might be an issue and intended for use with very select and mostly MOTU models of audio interface where the designers forgot or didn't bother to include DC blocking caps. Trouble is on top of that you want Volta to do 0 to 10v. You'd need to do research. While there are a dozen audio interfaces that work with Volta almost all don't put out that high a voltage. It's possible to offset the negative voltage these put out which would probably work with a hardware mixer that works with DC plus a DC source.  Expert Sleepers Silent Way adds to the concept. They offer an encode & simple DIY hardware decode method of generating DC from any audio interface. They also build ready to roll Eurorack modules that could conceivably go in a Doepfer Beauty Case - which is a very small, low cost powered housing.

The second issue is the 281e requires a 10v trigger 5v gate. Nothing I know of does that out of the box. I guess the options are to either not use it or mix one if you can generate a 5v trigger. My old Kenton can put out a trigger and a gate. I've not tried it but I would guess it could be done with a CV mixer.

nick

On Jun 16, 2012, at 3:32 AM, zaum wrote:

> I can think of 3 ways to get 1.2v/oct. Firstly is you just have a MIDI to CV converter that does it via calibration. You definitely want to research that before you buy. 


The Eardrill SourceSelector ModuleModule module can take a 1v/oct source and 5v gate, and convert them to Buchla standard.
ModuleModule info here: http://www.eardrill.com/modules/ModuleModule/

– C

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whoa getting alot of great info and the bottom line is that its not so simple- thats a bummer


--- In 200e@yahoogroups.com, zaum <zaum@...> wrote:

>
> Yes, you definitely have a bit of a conundrum. I believe in one of the NAMM interviews there was mention of a forthcoming Buchla keyboard or at least an often repeated rumor about one though there are no details or price point. I suspect it may be special in terms of innovative features and hence not inexpensive.
> 
> I myself have a 225e so I'm sort of plug and play with MIDI barring any OS bugs
> 
> Basically no one has made a native CV keyboard in about 30 years with piano style keys (I'm saying that because I don't mean a touch plate "keyboard" like the still in production Serge TKB). There are keyboards on the market that put out a CV but all of them are actually MIDI keyboards with an internal MIDI to CV converter. The new Akai MAX49 is an example but this includes the modular specialty keyboards too. I'm just mentioning that because an external MIDI to CV converter added to someone's choice of MIDI keyboard may be a better package. That's especially true to get the needed 1.2v/octave because what's on the market is geared to 1.0v/oct users and the external converters are more likely to have a 1.2v range.
> 
> I can think of 3 ways to get 1.2v/oct. Firstly is you just have a MIDI to CV converter that does it via calibration. You definitely want to research that before you buy. 
> 
> The second option is you run your 1.0v/oct CV into two inputs on a module that mixes DC voltage. I've not tried the 210e but it might work (or might be too course). I'm pretty sure the Verbos 254 will work. The concept is one muinput is set to 100% out and the other takes in the same CV again but is set to about 20% and adjusted to track with the input pot.
> 
> The third option as someone mentioned is Silent Way or Volta software. MOTU Volta was out first. It's Mac only which might be an issue and intended for use with very select and mostly MOTU models of audio interface where the designers forgot or didn't bother to include DC blocking caps. Trouble is on top of that you want Volta to do 0 to 10v. You'd need to do research. While there are a dozen audio interfaces that work with Volta almost all don't put out that high a voltage. It's possible to offset the negative voltage these put out which would probably work with a hardware mixer that works with DC plus a DC source.  Expert Sleepers Silent Way adds to the concept. They offer an encode & simple DIY hardware decode method of generating DC from any audio interface. They also build ready to roll Eurorack modules that could conceivably go in a Doepfer Beauty Case - which is a very small, low cost powered housing.
> 
> The second issue is the 281e requires a 10v trigger 5v gate. Nothing I know of does that out of the box. I guess the options are to either not use it or mix one if you can generate a 5v trigger. My old Kenton can put out a trigger and a gate. I've not tried it but I would guess it could be done with a CV mixer.
> 
> nick
>