ALM MUM M8 - Akai S950 based filter

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Veqtor
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ALM MUM M8 - Akai S950 based filter

Post by Veqtor » Sat Dec 02, 2017 3:32 pm

This filter has been all over fact mag, RA, etc so I guess no one's missed it :hmm:
But didn't find a proper thread w. details so I thought I'd post the details!

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‘MUM M8’ is an 8hp Eurorack low pass filter building on the filter design used in the classic Akai S950 12 bit sampler with the addition of resonance, voltage control, clipped saturation and a dedicated VCA.

The low pass filter gives the recognisable super smooth vacuum like tone sucking sound which works magic on complex sources. The addition of clipped overdrive and intentionally aggressive self oscillating resonance compliment the smooth filter core by juxtaposing it into more wasp like territory with acidic squeals and a more gritty sound.

The filter core is a 6th Order Butterworth switched capacitor type design featuring an analog core but controlled by a high speed digital clock. This produces the characteristic smooth sounding filter but, as with the original S950, has a relatively high minimum cut off as to avoid ‘clock bleed’ into the filter output from the digital control. This minimum cut of point can be controlled via trimmers on the rear of the module.

The motivation for the module came from discussing filters in classic samplers with the artist Jack Adams – aka Mumdance. Jack suggested investigating the S950’s filter well known as for it use in classic use in early jungle and hardcore. From that point onward Jack provided inspiration, help and feedback in the development of the filter. Big up Mumdance.

Features

* Eurorack recreation of classic sampler filter with added resonance and voltage control.
* Dual audio inputs, one with VCA and level control.
* Dual CV (with attenuversion) and manual control of cut off frequency.
* Single CV (with attenuation) and manual control of resonance.
* Ability to overdrive and saturate signals into filter core.
* Reverse polarity protection.
* Skiff friendly.
* Designed and Made in the UK
* Mumdance approved Image

VIDEOS:













LINKS:

Official Page

Resident Advisor article

Fact Mag Article


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Personal opinion:
Super stoked about this, already ordered one, really nice to get that old school jungle business filtering, just need some really terrible timestretch and 12 bit-ADC/DAC coloring loop :bananaguitar: :bananaguitar: :bananaguitar:

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Swain Voorman
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Post by Swain Voorman » Sat Dec 02, 2017 3:47 pm

Nice.

Anyone know if the chips involved with this one will make it a bit more rare like a few of his other modules? Debating grabbing one now or holding off for a second.

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Post by capski » Sat Dec 02, 2017 3:57 pm

He mentioned on instagram that it’s not limited like fizzle guts, just a smaller initial run.

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spacetime
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Post by spacetime » Sat Dec 02, 2017 6:07 pm

Always great design from ALM. Nice that it has a vca and attenuators

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Muse FTW
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Post by Muse FTW » Sun Dec 03, 2017 1:17 am

Sounds good in the demos. Not sure if I have use for one, yet at least, but it's tempting. ALM is always out of stock when I want to get it lol.

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Post by Jaypee » Sun Dec 03, 2017 5:54 am

Ah nice! Are Ad/da's s950 a big part of the sound too?
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Post by clusterchord » Mon Dec 04, 2017 12:52 am

i have a s950. when set with just a touch of resonance, this filter itself seems to really sounds SPOT ON to me. however, in case youre looking for akai sound the loop should be played from something dirtier. i would agree that AD/DA as well as whole pitch change playback scheme on akai are big part of its sound. transpose has very special tone.

so, from first listen, i'm thinking for oscillators and synth sounds it perhaps does not bring that much new stuff to the table compared to crapload of filters out there. but for processing drum loops or drum busses, fieldwork, prerecorded complex drones with lots of harmonics, distorted stuff - akais unique tone is just perfect. would love to have a pair just to dedicate to stereo stems, loops..
Last edited by clusterchord on Fri Dec 08, 2017 11:13 pm, edited 1 time in total.
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Bachelard
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Post by Bachelard » Thu Dec 07, 2017 10:55 pm

I'm also very stoked to trying one of these out. Just seems like a no-BS, warm and fuzzy LPF. Really like the 2 inputs.

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desdinova
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Post by desdinova » Fri Dec 08, 2017 1:18 pm

Grabbed one from Control, going to find a spot for it this weekend and give it a go.

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plainjanefrancis
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Post by plainjanefrancis » Fri Dec 08, 2017 8:08 pm

I see in their manual it says it self oscillates. I wonder if and how well it tracks.

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CF3
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Post by CF3 » Fri Dec 08, 2017 10:54 pm

would of been REALLY cool if this filter could of had an AD/DA circuit in it, to "down-sample" or bit crush(?) before the filter. Kind of like how you can "monitor" audio going thru some samplers and run it thru the converters like an effects box. Just a thought.

I very much applaud this effort :yay: The s950 is the sound of my youth.

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Post by Bachelard » Sat Dec 09, 2017 9:43 am

CF3 wrote:would of been REALLY cool if this filter could of had an AD/DA circuit in it, to "down-sample" or bit crush(?) before the filter. Kind of like how you can "monitor" audio going thru some samplers and run it thru the converters like an effects box. Just a thought.

I very much applaud this effort :yay: The s950 is the sound of my youth.
That would actually be VERY cool, brilliant idea.
I do have the Doepfer A-189-1 that I love to bits (pun intended, and recommend everyone get a 189-1 - it’s one of those hidden magical Doepfer modules). Could always run audio into that before the filter. :bananaguitar:

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ALM
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Post by ALM » Sat Dec 09, 2017 4:04 pm

If you want to bit depth and rate reduce there are plenty of decent pre-existing options out there for doing this.

I use it with the erica pico drums which already has a 12 bit output for sample playback (is the looped break source in demo vid). Also the Malgorithm works great to bit and rate reduce things pre filter. That said the filter still sounds very characteristic on a regular non reduced source.

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Post by mrerdat » Sat Dec 09, 2017 5:25 pm

Played around with this for a bit at Control yesterday. Really hard to put into words but it does the smooth liquidy thing really well without sounding sterile or boring. Smooth might be the best adjective to describe it. Though it can also get pretty interesting/gritty sounding too when pushed right on the edge of self-oscillation.

Built-in VCA is a super nice touch.

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Post by uuav » Thu Dec 14, 2017 7:55 am

Little demo from Perfect Circuit Audio
[video][/video]

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jameswalk
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Post by jameswalk » Thu Dec 14, 2017 11:04 am

Now that's how to do a demo. Sounds enticing.

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esko997
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Post by esko997 » Thu Dec 14, 2017 12:38 pm

Just picked up one of these, here is an example from some wiggling yesterday:

https://soundcloud.com/thedeadlives/zipquette-groove

Swirly bassline is Square+Saw of Dixie II+ into MUM M8. Square and Saw are being crossfaded via and LFO and a phase shifted output of the same LFO is modulating cutoff on the MUM M8. Resonance is at about 4'oclock.

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Post by uuav » Thu Dec 14, 2017 1:59 pm

jameswalk wrote:Now that's how to do a demo. Sounds enticing.
Yeah I was excited about this filter but I find ALM's demo a bit :despair:, neither technical nor musical. This one revive the hype in me.

esko997
Nice jam! The minimum (or maximum?) cutoff seems a bit high from the ALM videos how do you find it ?

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Post by lisa » Thu Dec 14, 2017 2:05 pm

Sounds super nice. :hyper: The connection to the old Akai sampler does nothing for me but the sound and the layout seems luxurious.
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esko997
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Post by esko997 » Thu Dec 14, 2017 3:19 pm

uuav not sure I totally udnerstand the question, but the moduation was attenuated so I wasen't sweeping the full range of the cutoff -- ie. it can go farther in either direction (closed or open).

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Post by uuav » Thu Dec 14, 2017 4:15 pm

esko997 Yeah sorry I should reread myself :p. When I hear the videos from ALM and Perfect circuit when the cutoff is full anticlockwise (closed) it feels like it cut at a higher frequency than the few vcf I usually use (most of them totally cut). I'm not judging your wiggling just asking how you feel about that.

But I just saw on the website: " [...]as with the original S950, has a relatively high minimum cut off as to avoid ‘clock bleed’ into the filter output from the digital control. This minimum cut of point can be controlled via trimmers on the rear of the module."

So it's a deal for me!

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esko997
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Post by esko997 » Thu Dec 14, 2017 4:18 pm

uuav wrote:esko997 Yeah sorry I should reread myself :p. When I hear the videos from ALM and Perfect circuit when the cutoff is full anticlockwise (closed) it feels like it cut at a higher frequency than the few vcf I usually use (most of them totally cut). I'm not judging your wiggling just asking how you feel about that.

But I just saw on the website: " [...]as with the original S950, has a relatively high minimum cut off as to avoid ‘clock bleed’ into the filter output from the digital control. This minimum cut of point can be controlled via trimmers on the rear of the module."

So it's a deal for me!
Oh I didnt think you were judging at all, no worries! But yeah fully closed there is still a decent amount of sound coming through, at least out of the box for me, havent messed with the trim pots yet.

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jameswalk
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Post by jameswalk » Thu Dec 14, 2017 5:19 pm

Now that's how to do a demo. Sounds enticing.

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Post by mrerdat » Thu Jan 18, 2018 2:05 am

I just got the MUM M8 last week to replace my broken Doepfer Wasp (RIP) and it's so good!

The digitally clocked analog core has a sound that I don't think I've heard yet in Eurorack. Filter sweeps sound super rich and timbrally really interesting. The resonance can get really squelchy and hard if you want it to be but is easy to tame. It doesn't do the thing that some filters do where you adjust the resonance control and it goes from 0 to annoying really fast with not much usable middle ground. The frequency and resonance controls are both super smooth and respond great to modulation.

It's got loads of character and definitely isn't a one trick pony but yet is somehow really versatile, which I don't think is usually the case for 'character' filters.

I recalibrated my cutoff frequency to be a little lower than the conservative factory calibration, which they go over how to do in the manual. I don't mind hearing some clocking artifacts in exchange for increasing the useable frequency range of the filter a bit.

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emergingstates
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Post by emergingstates » Thu Jan 18, 2018 5:10 am

Was this filter design also used in the older MPCs? 60,3000,2000xl ?

Thanks.

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