Conjured Circuits - JP6 Multimode VCF (MU)

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Conjured Circuits - JP6 Multimode VCF (MU)

Post by Conjure » Tue Dec 17, 2019 1:32 am

Image


IN STOCK AT NOISEBUG: https://www.noisebug.net/products/conju ... timode-vcf

https://www.modulargrid.net/d/conjured- ... timode-vcf

The Roland Jupiter-6 is a 1980s analog polysynth with a great sounding multimode filter that is quite distinct from other Roland filters of the same era. Here it is recreated in a 2U Moog Unit module with an added 2-pole 12dB low pass mode, reminiscent of the Jupiter-8. As with most vintage Roland filters, it is based around a cascaded Operational Transconductance Amplifier (OTA), in this case using the LM13700 OTA in place of the obsolete Roland IR3109 quad OTA.

4 modes: 24 dB low pass, 12 dB low pass, band pass and high pass
2 audio inputs, logarithmic attenuated
2 frequency CV inputs, one unipolar input and one attenuverted input
1 resonance CV input, attenuated

Coming in Jan 2020 as both an assembled module and a DIY kit available exclusively through SynthCube. Documentation and demos coming soon.

System80 JOVE design licensed under exclusive waiver of non-commercial license.

Give us a follow on Instagram to follow our progress:
http://www.instagram.com/conjuredcircuits/
Last edited by Conjure on Thu May 07, 2020 8:48 pm, edited 4 times in total.

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Post by Conjure » Tue Dec 17, 2019 1:33 am

Really excited about this one. The JOVE Eurorack filter is probably my favorite filter in the format and I desperately wanted it in MU. System80 has been awesome every step of the way while we port this. If you have a Eurorack system, do not sleep on their modules!

We're ramping up production on this one right now.

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Post by Faustgeist » Tue Dec 17, 2019 10:13 am

Looks great!
Trying to build up my 5U/COTK/MOTM and MODCAN B, send me a message if you are selling gear and thanks!

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Post by Prunesquallor » Wed Dec 18, 2019 1:38 am

Sounds great as well! 8-)

I posted Mylar Melodies review of the original System80 filter in the general Euro to 5U thread, but as this now has its own thread I'll just put it here. Fantastic module and Mylar (wiggler Stromcat) is one of the best modular reviewers out there.

[video]http://www.youtube.com/watch?v=VFNtQRDSUw4[/video]
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Post by Prunesquallor » Wed Dec 18, 2019 2:26 am

PS: Is this going to be available in Europe?
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Post by Conjure » Wed Dec 18, 2019 4:24 am

Prunesquallor wrote:PS: Is this going to be available in Europe?
Yep!

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Post by Prunesquallor » Wed Dec 18, 2019 5:14 am

Conjure wrote:
Prunesquallor wrote:PS: Is this going to be available in Europe?
Yep!
I'm liking you more and more! :party:
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Post by josaka » Wed Dec 18, 2019 11:31 am

mylar does do the best videos... nice sequences and gets the best side of the thing he is showing usually..

my question is really.. is it any different sounding from the other roland filters out there.. (outside the 12db/hp/bp switch) ? ?

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Post by Conjure » Wed Dec 18, 2019 11:44 am

josaka wrote:mylar does do the best videos... nice sequences and gets the best side of the thing he is showing usually..

my question is really.. is it any different sounding from the other roland filters out there.. (outside the 12db/hp/bp switch) ? ?
Unequivocally yes. That's why we ported it :) And I think Mylar's video captures that.

This filter specifically reacts to CV/Envelopes in a way I've only heard on a real Roland synth. Without getting too technical, it also gets the signal levels right and that's really what matters in making a Roland-esque OTA VCF.

In my opinion, this filter is a dream. I fell in love with it the second I used it in Eurorack and always gravitate toward it first in my patching.

We'll be having John L Rice and a few others do demos of it in their MU systems to hopefully answer that question better for you.
Last edited by Conjure on Wed Dec 18, 2019 11:58 am, edited 1 time in total.

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Post by josaka » Wed Dec 18, 2019 11:56 am

reason I asked was it sounds pretty similar to my corsynth 110 which does a wide range of the roland sounds form a pretty good 303 to a system 100M ish..
I also have 2 system 100s :) (which have a thicker resonance than the cor110..)

think quite a few have the corsynth and as space is an issue for many (me:) )
some need a bit of swaying.. :)

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Post by Conjure » Wed Dec 18, 2019 12:04 pm

josaka wrote:reason I asked was it sounds pretty similar to my corsynth 110 which does a wide range of the roland sounds form a pretty good 303 to a system 100M ish..
I also have 2 system 100s :) (which have a thicker resonance than the cor110..)

think quite a few have the corsynth and as space is an issue for many (me:) )
some need a bit of swaying.. :)
I also have a Corsynth 110. They are very, VERY different beasts. The obvious distinction being the 110 isn't an OTA filter, instead using the SSM2044 which was used on the Korg Mono/Poly, etc.

Still a fantastic module, just completely different from the Jupiter-6 OTA filter. In my opinion they sound nothing alike, nor should they.

We're not here to sway or beg. We believe the filter stands on its own merits :)

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Post by Prunesquallor » Wed Dec 18, 2019 12:57 pm

josaka wrote:mylar does do the best videos... nice sequences and gets the best side of the thing he is showing usually..

my question is really.. is it any different sounding from the other roland filters out there.. (outside the 12db/hp/bp switch) ? ?
I've also got the C110. 8-)

It's funny that you discarded the 12dB/hp/bp switch stuff in your parentheses, and didn't mention all the ins on the module. For me, this versatility is key. It might be the only Roland filter you need. It's certainly killed all my gas for all other OTA filters. YMMV
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Post by Sir Ruff » Wed Dec 18, 2019 1:54 pm

This looks great. Blasted lack of module space! Will probably buy anyway:)
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Post by josaka » Wed Dec 18, 2019 2:06 pm

Conjure wrote:
josaka wrote:reason I asked was it sounds pretty similar to my corsynth 110 which does a wide range of the roland sounds form a pretty good 303 to a system 100M ish..
I also have 2 system 100s :) (which have a thicker resonance than the cor110..)

think quite a few have the corsynth and as space is an issue for many (me:) )
some need a bit of swaying.. :)
I also have a Corsynth 110. They are very, VERY different beasts. The obvious distinction being the 110 isn't an OTA filter, instead using the SSM2044 which was used on the Korg Mono/Poly, etc.

Still a fantastic module, just completely different from the Jupiter-6 OTA filter. In my opinion they sound nothing alike, nor should they.

We're not here to sway or beg. We believe the filter stands on its own merits :)
my mistake on the corsynth serial numbers.. of course I meant the C101a.. :)
I have an SX240 and an octave CAT :)

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Post by Conjure » Wed Dec 18, 2019 2:39 pm

Sir Ruff wrote:This looks great. Blasted lack of module space! Will probably buy anyway:)
Thanks!

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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by Conjure » Fri Jan 24, 2020 8:59 pm

We're officially in production! Should be out in a couple weeks.

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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by Putte » Sun Jan 26, 2020 8:42 am

I´m just about to decide which filter to buy next, and this one turn up to ster things around for me. I´ve only spent a few minutes with a J6, and didn´t really have time to get to know its filter well. A demo would be lovely (Goes for many 5U filters out there, by the way).
I love that resonance can be controlled separately. An underestimated function in many cases, I´d say.
Also, two input channels, great. Nice to avoid using up the mixers all the time.

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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by Putte » Sun Feb 09, 2020 2:39 pm


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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by ericD13 » Sun Feb 09, 2020 4:18 pm

No 1V/oct input ?
"Unfortunately it took me forty years to conclude that nothing is possible outside DoReMi."
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Lots of 5U modules to sell in europe :
https://www.muffwiggler.com/forum/viewt ... p?t=219781

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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by Putte » Mon Feb 10, 2020 6:16 am

Didn´t notice that, but I´ve never used such a function before.
Here´s another demo. Hard to say, but like the sound.
https://soundcloud.com/conjuredcircuits ... e-v01-demo

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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by daveholiday » Mon Feb 10, 2020 8:52 am

ericD13 wrote:
Sun Feb 09, 2020 4:18 pm
No 1V/oct input ?
Agreed....this does seem weird to leave off filter tracking per 1v/oct.
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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by Conjure » Sun Feb 16, 2020 3:17 pm

ericD13 wrote:
Sun Feb 09, 2020 4:18 pm
No 1V/oct input ?
daveholiday wrote:
Mon Feb 10, 2020 8:52 am
ericD13 wrote:
Sun Feb 09, 2020 4:18 pm
No 1V/oct input ?
Agreed....this does seem weird to leave off filter tracking per 1v/oct.
Not weird at all.

Multimode filters on a circuit level, for the most part, do not self-oscillate as they are difficult to tame. This is true even of the JOVE filter, which this design is based from. That said, you will get temperature-compensated v/oct tracking of the cutoff using either CV input set to max. There are two to choose from in this design, with one being an attenuverter.

There's a reason the JOVE is one of the most popular filters among a sea of OTA offerings in Eurorack; there are other filters that can produce a sine wave for you, but you'd be hard pressed to find one that sounds this good, in my opinion.
Putte wrote:
Sun Feb 09, 2020 2:39 pm
Only a prototype test, but still:
https://soundcloud.com/conjuredcircuits ... it-testing
Thanks, I'll have some "proper" demos up soon. In these clips (which I meant to make unlisted, oops!), I was recording as reference to test how different input frequencies interacted with the filter bands. We were making some adjustments going up to 15v from 12v.

If you need a clearer example of how the filter sounds, don't be afraid to check out the System80 JOVE demos.

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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by daveholiday » Sun Feb 16, 2020 4:08 pm

Conjure wrote:
Sun Feb 16, 2020 3:17 pm
ericD13 wrote:
Sun Feb 09, 2020 4:18 pm
No 1V/oct input ?
daveholiday wrote:
Mon Feb 10, 2020 8:52 am
ericD13 wrote:
Sun Feb 09, 2020 4:18 pm
No 1V/oct input ?
Agreed....this does seem weird to leave off filter tracking per 1v/oct.
Not weird at all.

Multimode filters on a circuit level, for the most part, do not self-oscillate as they are difficult to tame. This is true even of the JOVE filter, which this design is based from. That said, you will get temperature-compensated v/oct tracking of the cutoff using either CV input set to max. There are two to choose from in this design, with one being an attenuverter.

There's a reason the JOVE is one of the most popular filters among a sea of OTA offerings in Eurorack; there are other filters that can produce a sine wave for you, but you'd be hard pressed to find one that sounds this good, in my opinion.
Putte wrote:
Sun Feb 09, 2020 2:39 pm
Only a prototype test, but still:
https://soundcloud.com/conjuredcircuits ... it-testing
Thanks, I'll have some "proper" demos up soon. In these clips (which I meant to make unlisted, oops!), I was recording as reference to test how different input frequencies interacted with the filter bands. We were making some adjustments going up to 15v from 12v.

If you need a clearer example of how the filter sounds, don't be afraid to check out the System80 JOVE demos.
My apologies, I was thinking more about the LPF having a 1v/oct tracking....but after looking at my own setup....none of my multimode filters have the provision for 1v/oct. While I am in no means an expert in filter topology I think that you should publicly shame and berate me for my insolence and audacity to question your methods.

I think the best way to do that would be to send me one of these filters with a note telling me what a jackass I am!

(pm me if you need a shipping address!)
It is all shits and giggles,

until somebody giggles and shits.

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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by Conjure » Sun Feb 16, 2020 4:36 pm

daveholiday wrote:
Sun Feb 16, 2020 4:08 pm
Conjure wrote:
Sun Feb 16, 2020 3:17 pm
ericD13 wrote:
Sun Feb 09, 2020 4:18 pm
No 1V/oct input ?
daveholiday wrote:
Mon Feb 10, 2020 8:52 am
ericD13 wrote:
Sun Feb 09, 2020 4:18 pm
No 1V/oct input ?
Agreed....this does seem weird to leave off filter tracking per 1v/oct.
Not weird at all.

Multimode filters on a circuit level, for the most part, do not self-oscillate as they are difficult to tame. This is true even of the JOVE filter, which this design is based from. That said, you will get temperature-compensated v/oct tracking of the cutoff using either CV input set to max. There are two to choose from in this design, with one being an attenuverter.

There's a reason the JOVE is one of the most popular filters among a sea of OTA offerings in Eurorack; there are other filters that can produce a sine wave for you, but you'd be hard pressed to find one that sounds this good, in my opinion.
Putte wrote:
Sun Feb 09, 2020 2:39 pm
Only a prototype test, but still:
https://soundcloud.com/conjuredcircuits ... it-testing
Thanks, I'll have some "proper" demos up soon. In these clips (which I meant to make unlisted, oops!), I was recording as reference to test how different input frequencies interacted with the filter bands. We were making some adjustments going up to 15v from 12v.

If you need a clearer example of how the filter sounds, don't be afraid to check out the System80 JOVE demos.
My apologies, I was thinking more about the LPF having a 1v/oct tracking....but after looking at my own setup....none of my multimode filters have the provision for 1v/oct. While I am in no means an expert in filter topology I think that you should publicly shame and berate me for my insolence and audacity to question your methods.

I think the best way to do that would be to send me one of these filters with a note telling me what a jackass I am!

(pm me if you need a shipping address!)
Hahaha. No worries! :tu:

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Re: Conjured Circuits - JP6 Multimode VCF (MU)

Post by josaka » Mon Feb 17, 2020 5:01 am

if being an idiot qualifies you for a free one...? yep send it on over...
I mean....I cant compete with dave.. but I am in the ballpark.

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