Is there any mod out there to make the LP echo an incoming Cv input to the output? Also, What about sending pitchbend +/- voltage to effect pitch Cv out?
Use an external Mult box? Something with four female 1/4" jacks wired together.
Like the bottom left of a CP-251:
I have a cheap Boss Mult box that does this or you can make your own.
Then use it to split the CV before it goes into the LP.
So let me explain my “situation” a little bit more. I am using the LP to drive a Rogue via CV control to be a second timbre. I also own the CP-251 but am having a difficult time having it effect both synths without messing up the tracking on either keyboard. The issue is if I put the pitch out(from the LP) into the CP-251 and then split the line to both keyboards, the tracking on the LP is messed up because its volage is doubled because it is effected by its own output. So I need to split the mixer output(without pitch CV) and isolate one of the splits to add the pitch voltage into some sort of a mixer to run to the Rogue. In attempts to do this I have made mistakes and purchased a passive Art mixer. The problem is that it is an audio mixer and functions quite differently. I found out that I may need what is called a Direct Coupled Mixer to get the job done. Any suggestions now?
How are you doubling your voltage source?
If you are asking about the “doubling” that I refer to in the previous post, that occurs by patching the LPs pitch cv out(to control the Rogue) into the mixer on CP-251. The + out goes into the 4 way multiple. This splits to Rogue cv in and Lp in. This is where the voltage increase occurs because it adds the sent voltage via CV out to the voltage that occurs from key depression. Remember that this is an example of what I do not want. I am looking for a way to control my Rogue via Cv control from the LP plus use the CP-251 to simutaniously effect both synths.
Why can’t you just use LP Pitch out to Atten, to Rouge pitch CV in. Why are you running the LP’s pitch back to the LP?
The CV from the lp is what controls it naturally. Unless you want to use the CP 251 to control the pitch you would have to be either adding to the voltage or subtracting something from it to make a difference from whats already inside the LP in the first place. For example, you can double the voltage, or you can fractionalize it and let your LP play quartertones.
Eric
Let me say that I really appreciate the help but I think that we’ve confused one another. Nevermind what I said about the voltage increase and running the pitch CV back into the LP because it is a moot subject and I was just explaining failed attempts in accomplishing my goal. Let me attempt to explain more clearly. I want to control the Little Phatty and the Rogue with the CP-251. For instance, have Sample and hold available at the turn of a knob(Master Volume). When this knob is fully attenuated there will be no effect on either keyboard. That is an easy process. For example, I have S+H and an LFO going into the Mixer attenuators. From the + out I jump over to the 4 way multiple to split the signal to the Rogue pitch CV in and the LP’s Pitch/Filter CV in. Now here is the tricky part. I want to also contol the Rogue from the LP’s keyboard. That requires me to somehow combine the voltages from the LPs pitch out with one of the CP-251’s split voltages without effecting the LP’s pitchout signal strength. I believe that this requires the use of another direct coupled mixer, like the one on the CP-251. I know audio mixers will not work because they mess with voltage/tracking. Does that make any sense? Am I doomed to buy another CP-251?
Okay lemme see if I follow you, lol.
So you want to play the LP’s keyboard but have it control the Rogue only and you want the LP’s oscillators to be controlled by the Cp 251.
SOmeone else might understand exactly what you are talking about but youre jumping around a bit explaining the goals vs the patching process.
Cp251 Sample and hold and LFO to mixer, to multiple to pitch of rogue and LP.
Lp’s keybord controls the Rogue but not the LP.
I don’t understand what you want to do with the master volume.
Now, the only thing that jumps out at me is that you can turn the LP’s local control off so the keyboard has no affect on the phatty, but a pitch cv from it will control the Rogue. I don’t know if turning the local control off will still make cv’s from the pitch and kbd gate outputs available. Instead of a cp251, mabe a midi/cv controller would help. I don’t see anyone doomed to have 2 cp units, that is very beneficial the bigger your system gets.
Sorry for the fuss…id really like to see you get this nailed down.
Is this nearing what you want?
Eric
Not exactly, I want to use the LP as a controller, to add a second timbre to the audio mix. This means that the LP’s oscillators will be heard along side the Rogue’s, creating the effect of a 3rd and 4th oscillator. I would be playing one keyboard, but getting sound(same pitch) out of both modules(LP and Rogue). This is why I was originally curious about CV echo. In theory, if I found a way to wire the pitch CV input to the pitch output on the LP, then the Rogue(second timbre) would respond similarly to the LP as it is effected by the incoming voltages from the CP-251. For instance if S+H was plugged into the LP’s CV in then the Rogue would S+H along side LP, as if it were just another oscillator. Make sense?
I don’t understand what you want to do with the master volume.
I was referring to the potentiometer labeled Master on the mixer of the CP-251. I like to use it as way to gradually switch my CP patch on and off.
Use the LP Pitch CV out to the attenuator (to get the Rogue to track), from the atten to the CP CV mixer then to the Rogue’s pitch input. The Rogue should track properly.
Then connect a patch cable into the S&H output, but insert it into the multiple so that it is less than halfway but still sitting in the jack, the connection not made. THen run a cord from the mult out to the LP’s pitch in. Run a cord from the multiple to the CV Mixer, and this will be mixed with the pitch cv. WHen you are ready to engage the Sample and hold, simply push the jack all the way in and it should engage in both units.
This should get you by until you can figure out a way to wire the jack.