Instruo I-ō47 multi mode filter

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mother misty
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Instruo I-ō47 multi mode filter

Post by mother misty » Tue Aug 13, 2019 8:19 am

Couldn't find much about this with the search function, is this new?

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A multi mode filter from Instruo :woah: :bananaguitar:

http://www.instagram.com/p/B1GqyeYBLyd/

Website Instruo

I-ō47 Multimode Resonator/Filter is a modern take on a vintage circuit design inspired by the classic 1047 module of the ARP2500. It has been designed with some extra features and quirks built in.
The internal VCA’s are a new hybrid design of matched transistors and precision op-amps.
With CV controllable centre frequency, resonance/Q and notch offset along side FM, strike and a complex dual input with wave shaping limiter, the I-ō47 is truly a filter for all occasions

Size
14HP
Depth: 27mm

Power
+12V: 50mA
–12V: 50mA

Specifications
Centre frequency range 16Hz to 16KHz
1V/octave, Coarse and Fine frequency controls
FM input with attenuverter
Low pass 12 dB/octave
High pass 12 dB/octave
Band pass 6 – 12 dB/octave dependent on Q
Notch with variable offset –/+ 2 octaves
Input with gain control
Inverted input with resonance dependent gain
Strike input for pinging the filter
Feedback switch which adds BP to the input for enhances resonance
Limiter based on tanh wave shaper which affects primary input (post gain fader)

Description
I-ō47 Multimode Resonator/Filter draws its circuit design inspiration from the classic 1047 module of the ARP2500 system.
Built upon the classic circuit architecture of the original, the design was refined with extensive experimentation using modern components along side classic configurations of discrete parts.
The internal VCA’s are a new hybrid design of matched transistors and precision op-amps.

Various refinements were also added such as voltage control over the variable notch offset which opens new worlds of dynamic sweeps and shaping.

There are two audio inputs on the I-ō47. The top runs through a gain stage, set by the fader, and has an optional limiter in line with it selected by the LIM toggle switch.

This limiter is an implementation of the tanh wave shaper circuit which applies the soft curvature of the tanh expression to any input signal. The gain fader sits before the limiter allowing for precise control over the amount of warm saturation that occurs with this style of limiting.

With a simple sawtooth wave, the limiter will gently curve the ramp and result in subtle enhancement of the low end of the signal’s tone.
For more complex audio signals (drum voices work a treat!) the limiter will give very musical results akin to gentle compression/overdrive, all the way to limiting and saturation.

The inverting input inverts the polarity of the input signal. This input is also directly affected in amplitude by the Q (resonance) control. As resonance increases, the signal amplitude will decrease, acting as a form of automatic gain compensation. Both inputs can be used simultaneously to mix two independent audio signals.

The variable Notch effectively crossfades between branches of the low-pass and high-pass signals. The result is an offset notch response that can shift up or down a couple of octaves from the centre frequency.
This part of the circuit was inspired directly from the 2500’s 1047 variable notch control.

CV was added by means of an optimised linear crossfading VCA pair. (The versatility of the variable notch output became apparent early on in development, so CV control was made a priority!)
Q (resonance) is CV controllable.

The feedback toggle sends an additional branch of the band-pass signal to the non-inverting input and allows for stable self oscillation of the Filter. It can be used to kick the resonance response up a gear.

The strike input can be used to ‘ping’ the resonance of the filter. It is designed to respond to signals at audio rate which allows for its use as an input for square wave tones.
Last edited by mother misty on Tue Aug 13, 2019 9:23 am, edited 3 times in total.

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Sanys
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Post by Sanys » Tue Aug 13, 2019 9:11 am

yes its new module.

"I-ō47 Multimode Resonator/Filter is a modern take on a vintage circuit design inspired by the classic 1047 module of the ARP2500. It has been designed with some extra features and quirks built in."
interesting!

donttouchmyrice
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Post by donttouchmyrice » Tue Aug 13, 2019 9:36 am

It's been on their website for well over 6 months now, I think. Demos were close to none back then, up untill recently. There's been a demonstration/showcase a week ago of some of instruo's modules that's posted on divkids YouTube channel, including some coverage of this filter.
It sounds & looks promising as far as I can tell.

peripatitis

Post by peripatitis » Tue Aug 13, 2019 9:52 am

so it is like the cms one?

flashheart
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Post by flashheart » Tue Aug 13, 2019 4:56 pm

Based very closely on the original from what he says.
Starts talking about the filter (including meeting Alan Pearlman!) at 26.22. Tried to link to that time directly but doesn't seem to work.
[video][/video]

Discussion thread already here BTW:
viewtopic.php?t=208649&highlight=
I'm not buying a maths though, not my idea of fun...

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synonymist
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Re: Instruo I-ō47 multi mode filter

Post by synonymist » Tue Aug 13, 2019 9:43 pm

mother misty wrote:Couldn't find much about this with the search function, is this new?
About five months ago I asked Jason if I could order this filter. He estimated a two-week turnaround, took my order info, then went dark.

It would have been nice to have, but I moved on. :zen:

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Ears
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Re: Instruo I-ō47 multi mode filter

Post by Ears » Tue Aug 13, 2019 10:17 pm

synonymist wrote:
mother misty wrote:Couldn't find much about this with the search function, is this new?
About five months ago I asked Jason if I could order this filter. He estimated a two-week turnaround, took my order info, then went dark.

It would have been nice to have, but I moved on. :zen:
Did you check in and make sure he didn’t lose track of your ask? I got one in that time period and pretty quickly. It’s important to remember these smaller makers are human and covering a lot of bases by themselves.

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mother misty
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Post by mother misty » Wed Aug 14, 2019 4:47 am

donttouchmyrice wrote:It's been on their website for well over 6 months now, I think. Demos were close to none back then, up untill recently. There's been a demonstration/showcase a week ago of some of instruo's modules that's posted on divkids YouTube channel, including some coverage of this filter.
It sounds & looks promising as far as I can tell.
Thanks for the info!
I wasn't aware this was announced months ago.
It sounds promising indeed, i'm usually not that crazy about instagram sound demos, but i love what's happening there :tu:

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synonymist
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Re: Instruo I-ō47 multi mode filter

Post by synonymist » Wed Aug 14, 2019 6:16 am

Ears wrote:
synonymist wrote:
mother misty wrote:Couldn't find much about this with the search function, is this new?
About five months ago I asked Jason if I could order this filter. He estimated a two-week turnaround, took my order info, then went dark.

It would have been nice to have, but I moved on. :zen:
Did you check in and make sure he didn’t lose track of your ask? I got one in that time period and pretty quickly. It’s important to remember these smaller makers are human and covering a lot of bases by themselves.
Thanks, but I have plenty of experience with makers and small business owners. Acknowledging that Jason is a highly intelligent young man, I allow that he will run his business as he thinks best, or will do so to the best of his ability. I don't take personally the effect of that on my order.

Anyway, it's not as if I divested my Instruō modules because of this event. I still love my Cš-L, Tš-L, and Cèis. :)

peripatitis

Post by peripatitis » Wed Aug 14, 2019 10:23 am

peripatitis wrote:so it is like the cms one?

to answer my own question from the video,
he has added a feedback loop so that it will self-resonate and a tanh in that loop so that the resonance doesn't get too loud..

It looks interesting...

damase
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Post by damase » Wed Aug 14, 2019 10:50 am

very good sound. lots of character, the resonance is very pleasing. seems to ping in an incredibly pleasing way too

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bedhed3000
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Post by bedhed3000 » Wed Aug 14, 2019 6:34 pm

Looks like this is available for pre-order at Perfect Circuit all of the sudden.
I might swap out the Jove for this guy. It sounds incredible in that video.

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Post by BlinkyLights » Fri Aug 16, 2019 5:48 am

I love the sound and want one.

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Daisuk
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Post by Daisuk » Sun Sep 01, 2019 4:10 am

Any more demos of this one around?

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rew_
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Post by rew_ » Wed Sep 18, 2019 10:25 pm

this arrived via PC! I am excite

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Sanys
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Post by Sanys » Tue Sep 24, 2019 8:35 pm

bump for proper demo :help:

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cloudleft
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Post by cloudleft » Thu Sep 26, 2019 8:43 am

This looks amazing. I had a Modcan Multimode which is ARP 2500-ish and sold it (which I regret very much). This looks to cover those bases and much more. The dedicated strike input is straight off the classic Dennis P Colin design, and I'm reasonably sure it's that striking sound you hear towards the end of "Kyema" by Éliane Radigue.

Those interested in the old ARP design may find this paper interesting:
https://www.guitarfool.com/ARP2500/Denn ... nPaper.pdf

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thetwlo
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Re: Instruo I-ō47 multi mode filter

Post by thetwlo » Thu Mar 19, 2020 1:17 am

why are there still, few samples or info on this? how does it compare with the CMS 1047? or ARP 2500?
If it's based on the 1047, the greatest filter of all time IMO, why isn't there more enthusiasm for this, even from the maker?

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hel1
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Re: Instruo I-ō47 multi mode filter

Post by hel1 » Thu Mar 19, 2020 11:37 am

well, being an owner: I love the filter, still discovering all the possibilities.
but, since I'm in Italy, yes, the north, and since I try to manage a large project here, I don't have the time, nor the space in my head to write or make a clip about it.
but so far I love it, (as I do my SEM clone and my Wasps)

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Re: Instruo I-ō47 multi mode filter

Post by thetwlo » Thu Mar 19, 2020 12:22 pm

hel1 wrote:
Thu Mar 19, 2020 11:37 am
well, being an owner: I love the filter, still discovering all the possibilities.
but, since I'm in Italy, yes, the north, and since I try to manage a large project here, I don't have the time, nor the space in my head to write or make a clip about it.
but so far I love it, (as I do my SEM clone and my Wasps)
shit, just be safe!

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hel1
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Re: Instruo I-ō47 multi mode filter

Post by hel1 » Sat Mar 21, 2020 5:27 am

thanks, I'm trying to

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Whatisvalis
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Re: Instruo I-ō47 multi mode filter

Post by Whatisvalis » Mon Jul 20, 2020 3:56 pm

I wasn't expecting the LPF to completely close off the sound on this but has anyone noticed with the cutoff at 9 o clock the signal is at is lowest, then the signal increases with the cutoff closed.

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Re: Instruo I-ō47 multi mode filter

Post by ari ellis » Mon Jul 20, 2020 4:54 pm

Whatisvalis wrote:
Mon Jul 20, 2020 3:56 pm
I wasn't expecting the LPF to completely close off the sound on this but has anyone noticed with the cutoff at 9 o clock the signal is at is lowest, then the signal increases with the cutoff closed.
Yeah mine does this too. I find that in general this filter sounds amazing, but has a lot of quirks / unpolished spots.

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