Im thinking about building a “modulation box” for my foogers.. A couple of LFOs, S&H and attenuators.
Ive been looking at doepfers A-146 LFO, but it has an output of -2.5V/+2.5V.
What can I do about that?
Seems like most of the modular LFOs have positive/negative outputs..
Help!!
But Moog already has what you need! (albeit with only one LFO, not two, but look at what else it has!)
The CP-251 provides a dual waveform LFO, Noise Generator, Sample-and-Hold circuit, as well as two attenuators, a lag processor, a CV mixer and a 4-way mult. This gives you ways to modify, mix, and distribute control voltages to produce the incredible variety of sounds and effects that analog synthesizers are famous for.
Same specs as the CP-251. The whole Doepfer line is highly compatible with Moogs. I am planning on purchasing more Doepfer modules, but I find the CP-251 is a must for mooging modular style.
Thanks…
I love the CP-251, but I need at least two LFOs + S&H.
The fact that it only has one LFO, and the S&H is triggered by that same LFO is making me go modular.
I have to replace my MP-201 too.. 
I need to control the LFO-rates and attenuation(/amount) with dedicated knobs..
Right. It’s not an issue.
There are many kinds and ranges of CV, depending on what they are designed to accomplish.
A typical CV to control Filter is 0 to 5. Out of bound values are ignored, or actually interpreted as either 0 or 5.
A typical LFO waveform, which is a kind of audio waveform is normally + and - . But used as a CV, it does not have to be. For example, processed through the Mixer of a CP-251 with an offset, it can become all negative or all positive and will still do some kind of magic, depending where you send it to.
A pitch CV, as specified in Doepfer is 0 to 5v. I am not sure exactly how Doepfer handles negative voltages in all their modules, but in the Moog world, it can be negative. For example, the range of the pitch CV on the Voyager (assuming 8’ setting I guess) that the 44 notes keyboard covers is -.916V to 2.66V. The rule is simple, add one volt, pitch is one octave higher, substract one volt, pitch is one octave lower. You can always add or substract within the range, sometimes beyond, even if it means going sub-audio or over.
The behavior of a particular device or CV input jack, when out of bounds, depends on design and implementation.
I suggest you download the Voyager user manual and look at the page talking about the VX-351. There’s a table explaining the range for CV’s the unit handles and is a good starting point for understanding CV’s at large.
Edit :
Another example is the Gate CV. Literature says it should be either 0 or 5 volts. That’s the values the Voyager or LP generate when the Gate is Off or On (key pressed). In real life, when fed into a Gate Input, anything below 2v, the gate is off, above, the gate is On. Should you be concerned to fry something if over 5v, as per specification? Actually, NO. The Etherwave Plus generates a trigger On at 10v (like many vintages), yet it is safe to use with the Voyager or LP.
Thank you VERY much for that explenation!!
“Out of bound values are ignored, or actually interpreted as either 0 or 5.”
These words calmed my nerves quite a lot.. I will definitely take a look at the Voyager manual.
All my knowledge of control voltage comes from moog-gear. The molular world with lots of different voltages and manufacturers seems a little overwhelming at first.
Thanks again:)
No problem… It’s a pleasure to answer to someone who actually interacts and is thirsty for knowledge.
It was all gibberish to me in early days, but it eventually sinked in and the rewards are great 