system to control Cwejman EQ

erich · Joined: Jan 08, 2007 Posts: 58 Location: US Audio files: 1

I'm not exactly sure if this will work the way I'd like it to or not, so if someone would tell me how to do this I'd be very thankful.

I want to have pretty extensive control as to the character of eq changes in real time. One or two pedals that output CVs, into some multiples, but from the multiples I need to be able to invert CV's and then scale the ranges, and also define where the ranges begin and end. I may want the movement of the pedal (or pedals) to cause extreme changes in the eq frequency, but slight changes in the resonance value, and an even more extreme sweep in one of the other eq channels value, you probably get the picture, hope it makes sense. I was looking at other companies, but just found the cwejman Four Channel Voltage Controller and it may be exactly what I need. I would like to be able to define a kind of base frequency range for each EQ channel, say I want the frequency of one channel to be centered around 200hz, and sweep up and down by 100, but then have another EQ channel centered at around 500hz, and sweep up or down by 200hz, then have the gain of one channel raise by 6dB, and the gain of another channel lower by 3dB, etc. All using one or two pedals for control. Could I use the offset and level controls on the Channel Voltage Controller to do this? And the att-4 quad attenuater level/bias shifter, what is that used for? Could it help here?. Can someone help me figure out how to do this? Does it sound like I can do these things with these two modules? I think that I can probably accomplish some of these things but maybe not all of them.

Thanks very much for any help

Jari Jokinen · Posted: Mon Dec 10, 2007 1:59 pm Post subject:

I don't have M-ATT4, but I think it can do what you want. I am not sure how the master section works though.

If I am not mistaken: When a plug is insterted to a VC input of the EQ module, the corresponding knob is disabled. This seems to necessitate something like the M-ATT4. My VC-ADSR2 behaves like this, and I think it is unconvenient.

If in doubt, you should ask Mr. Cwejman. He is very helpful.

erich · Joined: Jan 08, 2007 Posts: 58 Location: US Audio files: 1

thanks for the advice. I am really hoping this is possible. Cwejman is really taking CV control to a whole new level, from what I've seen from modular synths.

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Jari Jokinen · Posted: Tue Dec 11, 2007 1:35 pm Post subject:

Jari Jokinen · Posted: Tue Dec 11, 2007 1:39 pm Post subject:

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

erich · Joined: Jan 08, 2007 Posts: 58 Location: US Audio files: 1

thanks to everyone for the discussion. I keep checking back in and learning new things

Jari Jokinen · Posted: Wed Dec 12, 2007 2:24 pm Post subject:

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Jari Jokinen · Posted: Sat Dec 15, 2007 7:01 am Post subject:

erich · Joined: Jan 08, 2007 Posts: 58 Location: US Audio files: 1

Hope someone sees this, I've been to busy to think about this for a bit

[Oh! interesting module . That seems that one Analogue Sistems RS230 + one Analogue Solutions ATT4 could be what erich needs.

And If I have understood the Cwejman M-ATT4, it is designed for VC the VCEQ, so it is an option also.
]

These two modules from analogue solutions and analogue systems look like they would cover the inversion and the attenuating, but I'd like to be able to specify different ranges for each EQ channel (which I believe the attenuating would solve), BUT also where each range is centered. I would need to be able to adjust so one EQ channel would only sweep from 500Hz to 700Hz, but another channel would only sweep from 250Hz to 300Hz, another channel from 850Hz to 950Hz, etc. not to mention adjusting the gain and resonance settings using different ranges at different points within the total available range, if that makes sense. The attenuators could adjust the range, but I still don't see a way to define where that range begins and ends. Could I just use the knobs to set where the range was centered? I'm thinking that the offset control on the Cwejman might be used for this. (I just emailed cwejman to ask about this) Basically I'd like to be able to morph between EQ settings. I just got Max/MSP, and have a midi to cv converter. This could be done using those, but if it is possible, and not incredibly expensive, I'd like to be able to do it without a computer. Please let me know if I'm communicating this clearly, I'd be glad to try to adjust my explaination if it isn't coming across well. Again, thanks to everyone for the help. [/quote]

Sound · Joined: Jun 06, 2006 Posts: 842 Audio files: 1

Hi erich.

The center is done by the frequency knob of the EQ.

Ej 500hz

If you input a LFO to the freq input, the cut off point will sweep from 16hz to 16khz.

If you attenuate the LFO signal you could swep the cut off point ej 300hz to 900hz . It means that with an attenuator you can control the amplitude of the sweep.

Any way, if you buy these modules and a passive multiplier, you can start to experiment with them and understand about it and also how can work the m-att-4 and if you need it.

Also they are a very useful modules that you always will use. Also they are cheap.

Oscar -the beguinner- Very Happy

erich · Joined: Jan 08, 2007 Posts: 58 Location: US Audio files: 1

I emailed Cwejman about this, he said:

"the annouced M-ATT4 is an interface for controlling of attenuation and voltage offset for each channel (totally four). There is additionally a master offset and voltage spread (dedicated for the RES-4). The M-ATT4 has no fixed bias control as the ATT-4 has. The bias control (by switch) convert the incomming standarized voltage +- 5 Volts (waveform outputs from VCO-2RM and D-LFO and others) to 0 to 5 Volts for controlling of parameters such as level, q-peak and others"

I wrote:

I would like to be able to define a kind of base frequency range for each EQ channel, say I want the frequency of one channel to be centered around 200hz, and sweep up and down by 100, but then have another EQ channel centered at around 500hz, and sweep up or down by 200hz, then have the gain of one channel raise by 6dB, and the gain of another channel lower by 3dB, etc.

he wrote:

"The M-ATT4 and ATT-4 has no build-in voltage limiters so it can't be done exactly as you want. Maybe other companies has limiting voltage processors."

He was very helpful and made it a point to tell me to email him again if I had more questions. Which I might, at some poiint, but I must say I'm getting to the point where I might just buy the Cwejman EQ and dig into Max/MSP to control it. I know I can set up exactly what a want if I'm willing to spend the time with that. Any new suggestions? Voltage limiters out there? I hope this is giving other people a little bit of useful info as well