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Researching ganged Quad ADSR and Quad Low Pass Gate
Old 4th August 2019
  #1
Gear Addict
Researching ganged Quad ADSR and Quad Low Pass Gate

In order to finish my Polytribe synth I will have to set up a small modular.

I will explain what I have and how it works and what I need as well.

Already have and working:

4 Monotribes with CV/Gate control.
The CV/Gate is provided by CV OCD.

4 pitch CVs for Note 1,2,3,4 are provided
4 Gates for Note ON/OFF are provided for each note.

Please note I send an always on gate to the oscillators
to avoid clicking sounds that plaque Monotribes.


Now that stuff I need and wonder if exists in stock still.

The Note Gates would trigger a ganged quad ADSR which will in turn
trigger the Quad Low Pass Gates. The low pass Gates recieve the
audio from each of the Monotribes.

I have seen a Sputnick Quad LPG, but not sure if this can still be bought.
Pretty sure a Quad ADSR or even AR would suit me.

Anything out there?
If not I will retire this project as it is into 3 years of R&D now.

Thanks
Old 5th August 2019
  #2
Lives for gear
The sputnik quad LPG is nice, but may be hard to find 2nd hand.
If you don't DIY, you could commission someone to build the thomas white quad LPG. Full kits are typically available from synthcube. It's a very deep board and you'd need a case with plenty of depth.
For quad envelopes, they are a lot more common.

Have you used your perfourmer to pair with the 4 monotribes? that's another option.
Old 5th August 2019
  #3
Gear Addict
Hi!
Do you know if the quad lpg kit is smd or throughhole.
At 56, my near vision is shot for SMD.




Quote:
Originally Posted by bluegreengold View Post
The sputnik quad LPG is nice, but may be hard to find 2nd hand.
If you don't DIY, you could commission someone to build the thomas white quad LPG. Full kits are typically available from synthcube. It's a very deep board and you'd need a case with plenty of depth.
For quad envelopes, they are a lot more common.

Have you used your perfourmer to pair with the 4 monotribes? that's another option.
Old 5th August 2019
  #4
Lives for gear
Quote:
Originally Posted by GAF Vu Master View Post
Hi!
Do you know if the quad lpg kit is smd or throughhole.
At 56, my near vision is shot for SMD.
It's entirely through hole, and it's not a terribly hard build as far as the boards go. The wiring of the panel can be tricky. Looks like it is also available assembled, but pretty pricey a couple hundred more than the full kit.

When I did mine, the LPG boards took one evening to make, and the wiring another.

Compared with the Sputnik quad LPG, it has fewer mix out options. The sputnik allows individual, odd / even or all outputs. The configuration on the panel in the kit, has individual outputs and a sum output. Each LPG board has additional mixer circuits that could be wired up for other purposes. The linked build info at the synthcube page explains some of the possibilities.
Old 5th August 2019
  #5
Gear Addict
Here is the page for the product.
The link to more info is a 404.
Do you have access to the original pdf that came with it?
Like to know if the LPG is only VCA or VCF on the switch,
or if it has a middle position for both VCF/VCA?

Thanks

https://synthcube.com/cart/dj-thomas...white-quad-lpg

Quote:
Originally Posted by bluegreengold View Post
It's entirely through hole, and it's not a terribly hard build as far as the boards go. The wiring of the panel can be tricky. Looks like it is also available assembled, but pretty pricey a couple hundred more than the full kit.

When I did mine, the LPG boards took one evening to make, and the wiring another.

Compared with the Sputnik quad LPG, it has fewer mix out options. The sputnik allows individual, odd / even or all outputs. The configuration on the panel in the kit, has individual outputs and a sum output. Each LPG board has additional mixer circuits that could be wired up for other purposes. The linked build info at the synthcube page explains some of the possibilities.
Old 6th August 2019
  #6
Lives for gear
Quote:
Originally Posted by GAF Vu Master View Post
Here is the page for the product.
The link to more info is a 404.
Do you have access to the original pdf that came with it?
Like to know if the LPG is only VCA or VCF on the switch,
or if it has a middle position for both VCF/VCA?

Thanks

https://synthcube.com/cart/dj-thomas...white-quad-lpg
https://naturalrhythmmusic.com/lopass
Old 6th August 2019
  #7
Gear Addict
cool! thanks.

Quote:
Originally Posted by butter View Post
Old 6th August 2019
  #8
Lives for gear
Quote:
Originally Posted by GAF Vu Master View Post
or if it has a middle position for both VCF/VCA?
it has a middle position for mixed vcf/vca, it is also resonant (unlike the sputnik)
Old 7th August 2019
  #9
Gear Addict
I'm pretty happy with the DJ Thomas Quad Vactrol LPG.

What do people think of this as a Quad ADSR choice?
https://www.detroitmodular.com/malek...-envelope.html

Compact is the key to this potential setup and I want to make sure
I do my pre-purchase R&D. At present I have no eurorack,
but the GAS is growing!
Old 15th August 2019
  #10
Gear Addict
I will be ordering all the items soon.
I have 0% exposure or knowledge about eurorack
but want to know with me buying all Doepfer gear

A-100 Mini Case
A-141-4 Quad VCADSR
A-132-8 Octal VCA
A-132-2 Quad VCA

will the connections to the power bar be self evident?
Don't laugh, everyone has to start somewhere.

I do not want to connect anything backwards.
Old 15th August 2019
  #11
Lives for gear
Quote:
Originally Posted by GAF Vu Master View Post
but want to know with me buying all Doepfer gear

will the connections to the power bar be self evident?
Don't laugh, everyone has to start somewhere.

I do not want to connect anything backwards.
Doepfer gear does not have protection diodes for reverse polarity power, so you best be sure you have the direction of the cables correct when you plug it in. But since all your gear is doepfer it will all follow their standard.

As a rule the -12V line is marked with a colored wire (typically red) and the colored wire has to be aligned to the bottom of the bus board where you find also the -12V imprint.
Old 15th August 2019
  #12
Gear Guru
 
Derp's Avatar
Quote:
Originally Posted by GAF Vu Master View Post
I will be ordering all the items soon.
I have 0% exposure or knowledge about eurorack
but want to know with me buying all Doepfer gear

A-100 Mini Case
A-141-4 Quad VCADSR
A-132-8 Octal VCA
A-132-2 Quad VCA

will the connections to the power bar be self evident?
Don't laugh, everyone has to start somewhere.

I do not want to connect anything backwards.
Also heads up: The mini case's power isn't keyed, so make sure it's red stripe down on both the module and the power supply.

Keep in mind that not all modules are red stripe down, but it is the case for Doepfer that they are.
Old 16th August 2019
  #13
Gear Addict
Thanks for all the info.
My Monotribes and I thank you for this!
Old 16th August 2019
  #14
Lives for gear
Quote:
Originally Posted by GAF Vu Master View Post
I will be ordering all the items soon.
I have 0% exposure or knowledge about eurorack
but want to know with me buying all Doepfer gear

A-100 Mini Case
A-141-4 Quad VCADSR
A-132-8 Octal VCA
A-132-2 Quad VCA

will the connections to the power bar be self evident?
Don't laugh, everyone has to start somewhere.

I do not want to connect anything backwards.
I'd suggest hitting the brakes for a moment, and tell us what problem you are trying to solve, how you envisage this whole setup working, and also how you got from a quad lpg to 12 VCAs.

Even the quad lpg was a bit of a misdirection - blinded by the quad thing, you ended up going down a whole road of DIYing a complex module, when probably two MingQu DPLPGs, would have done as good a job for your appilcation. And thinking further along those lines, running just a gate into a passive slew would give you a crude envelope, so for under $20 in parts you could possibly build something that wouldn't require power and cases if all you are really trying to do is to avoid the internal VCAs on the monotribes...? Anyway LPGs are irrelevant now anyway.

Your current plan seems to me to get you something that is not versatile or expandable and might not even really get you the result you are after. I could well be wrong and this box will suit your exact purpose, but seems to me you are going get yourself stuck with something very limited. Anyway, do what you want, but I think a sanity check is order...
Old 17th August 2019
  #15
Gear Addict
System built,simplified to 2 voice from 4. Built with already "off-the-shelf" synths and doo-dads I had.
Could not risk the "devil I did not know".

Simplified to a 4 VCO, 4 VCF (1 VCF per Monotribe, plus the 2 in series on the MS-20xx) rig by using
-MS-20 Kit as midi controller via Kenton to USB
-Midi to CV to 2 Monotribes from CV OCD
-CV OCD set to low note mono pair
-MS-20Kit by default high note
-EG1 controlling cutoff (and by extension) volume on the "gated-on"
Monotribes. Compressors took care of residual levels and noise.

I can live with 4 VCO duophonic, plus I can build the rig
on top of the MS-20kit for easy access to the Fc and res controls of
Monotribes sitting atop the MS-20Kit.

So no need for external ADSRs or VCAs.
42 years I have been into synths, not quite ready for modular.
Maybe when I retire in 9 years!

Sample dry snippet of the MutaTRIBE in mp3.

I can close this thread now!


Quote:
Originally Posted by butter View Post
I'd suggest hitting the brakes for a moment, and tell us what problem you are trying to solve, how you envisage this whole setup working, and also how you got from a quad lpg to 12 VCAs.

Even the quad lpg was a bit of a misdirection - blinded by the quad thing, you ended up going down a whole road of DIYing a complex module, when probably two MingQu DPLPGs, would have done as good a job for your appilcation. And thinking further along those lines, running just a gate into a passive slew would give you a crude envelope, so for under $20 in parts you could possibly build something that wouldn't require power and cases if all you are really trying to do is to avoid the internal VCAs on the monotribes...? Anyway LPGs are irrelevant now anyway.

Your current plan seems to me to get you something that is not versatile or expandable and might not even really get you the result you are after. I could well be wrong and this box will suit your exact purpose, but seems to me you are going get yourself stuck with something very limited. Anyway, do what you want, but I think a sanity check is order...
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Old 19th August 2019
  #16
Lives for gear
 
ImJohn's Avatar
There are over 30 quad EGs listed on ModularGrid:
https://www.modulargrid.net/e/module...aryfunction=31
Old 21st August 2019
  #17
Lives for gear
 
Ossicle's Avatar
Quote:
Originally Posted by bluegreengold View Post
The sputnik quad LPG is nice, but may be hard to find 2nd hand.
Yeah, but you can buy one new from Juno - better hurry though. I dig mine.
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