Moog Music Forum

Hey guys,

Is there a way to re-assign the mod wheel to produce a hard chop square wave tremolo instead of modulation? I bought a CP-251 to achieve this but it ended up attenuating the overall volume instead of blending the effect into the signal.

Thanks.

Are you using a Performer or Old School Voyager?

One thing that you can certianly do is to send the square wave from the CP 251 into the Vol input. This will give you the effect you are looking for. I don't know what you mean by "Hard Chop".

An alternate method that I thought of is using the Programmable destination to "Panorama", this will give you a tiny bit if you are using a mono output to an amp, but this isn't that effective.

Finally, something that sounds EXACTLY like the first method I described, is to send that square wave to the WAVE destination, but at this point it becomes pulse width modulation, to the point where the waveshape gets so skinny it is not audible. You can't really tell the difference, but you should have your wave position set around the square wave or experiment.

Hope this helps,
Eric

Hey Eric,

I bought an Electric Blue.

Initially I ran the CP-251 into the volume jack, but unlike a guitar amp where you can blend the intensity of the tremolo into the original signal, the CP-251 attenuates both the original signal as well as the trem.

The goal is to get a jack hammer type tremolo that can be blended in and out smoothly with the mod wheel without effecting the volume of the original signal.

I know this might sound a little complicated, but if I could get all this to work like an old Fender guitar amp, I'd be happy.

I appreciate the help.

first, i don't have a voyager,

i don't know if mixing the tremolo is possible, because to create the tremolo you are modulating the original volume, if the voyager has a second vca you could use that one as a clean signal, and mix that with the tremolo. if you determine the voyager is not capable of the tremolo you desire, i am certain the ringmod will not fail to deliver

So those fender amps were single or dual speakers?

I know my Rhodes has a busted tremelo circuit that works as follows. It is a photo receptor that responds to two lanterns. THe lanterns alternate left and right so you always hear your tone, but it alternates between left and right. This is coming from the suitcase amp, so its actually two seperate amps for L/R channels.

THe voyager is a stereo instrument so it should be able to do something like this with the pan.

Honestly Im not familliar with the Jack Hammer, but if you had a ring mod, that functions excellently as a teemelo. You could use 1 channel to an amp, and the second out to the Ring Mod. This is overcomplicating your gear though. Do you know of a good example of what you are talking about that might be on youtube?

Eric

Run the voyager MONO and route the LFO Square to the mod wheel. Route the mod wheel to Panorama.
Wheel down will give full signal, wheel up will pan left and right. You are only sending the one channel to the amp. (Tremolo)
You can send sine or square or use OSC3 as an LFO. Using OSC 3 gives the ability to blend the wave to form the tremolo. Use afertouch to control the WAVE from SQ to Pulse!
Make sure you are using the RIGHT output of the Voyager or the Panorama will have no effect.

I think you want to invert/attenuate the waveform and use the offset in the mixer section of the CP-251.

The square wave normally goes between 0 and +5 Volts. Inverting it will make it go from 0 to -5 Volts. Using the offset to increase the voltage can make it go from 5 to 0 Volts. Then you can control the attenuation amount to get the control signal to be a steady 5 Volts (max attenuation) or oscillate between 5 Volts and any other value.

The piece that I'm missing is using the mod wheel to control the attenuation setting. I'm not sure what's possible.

The Mooger RM 102 can "act" as a superb Tremolo on the low setting.

analoghaze wrote:The Mooger RM 102 can "act" as a superb Tremolo on the low setting.

True, but it can't do the effect he is looking for, namely slowly increasing the intensity of the effect. It seems like the mix knob would do that, but on mine it changed the shape of the amplitude envelope.

Bryan T wrote:...namely slowly increasing the intensity of the effect.

That is exactly right.

Doing some trial and error, I sent a CP-251 square wave to the Voyager filter input, then messed with the offset and I think it sounds pretty darn good.

Guys, I apprectiate the help. I'm gonna leave the mod wheel alone.

EricK wrote:Do you know of a good example of what you are talking about that might be on youtube?

Eric

Eric, you car hear Johnny Marr's rhythm guitar with hard trem here, this was done with an old Fender Twin.

http://www.youtube.com/watch?v=_U5HpeA_WSo

Here is Billy Gibbons using hard chop trem for rhythm, but who knows what he uses.

http://www.youtube.com/watch?v=d7eNDZLwo8Q