ALM MUM M8 - Akai S950 based filter

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Gyroscope
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Post by Gyroscope » Thu Feb 01, 2018 1:49 pm

Man, the last part of that demo :love:

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tauburn
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Post by tauburn » Tue Oct 30, 2018 1:04 am

Just received mine today and it is a perfect combination with basimilus. Really adds a polish to the sound and makes it more drum machine and less like synth drums if that makes sense. The second input for the vca is nice because you can overdrive it nicely using a melody and drums into the filter.

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BailyDread
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Post by BailyDread » Tue Oct 30, 2018 9:00 am

mrerdat wrote:
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.
anyone have a demo of this? I'd like to hear how these clocking artifacts sound... how low can it go?

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Post by natureclubcassettes » Tue Dec 11, 2018 9:08 pm

can anyone confirm if the filter of the S950 is the same as the on on the AX-60? it sounds really similar in demos. Thanks!

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Post by thetwlo » Tue Dec 11, 2018 11:49 pm

natureclubcassettes wrote:can anyone confirm if the filter of the S950 is the same as the on on the AX-60? it sounds really similar in demos. Thanks!
https://en.wikipedia.org/wiki/Akai_AX60
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ALM
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Post by ALM » Wed Dec 12, 2018 4:33 am

Im pretty sure the s612 and s900 share at least a very similar filter but I don't know of any synths that include it.

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Post by wavefold » Thu Dec 13, 2018 6:56 am

finally ordered mine after discussing it with Jack after a set, he totally sold me this adorably gorgeous module. can't wait to wreck some amens through it :hyper: :party:
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Post by lewisr7 » Sun Jan 20, 2019 5:54 am

...

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rew_
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Post by rew_ » Thu Sep 12, 2019 6:48 pm

just popping in to say that I'd had this in my rack for awhile and finally admitted I found it a little lifeless—just not a lot "filtering" going on, very little difference it seemed between 10 o'clock and 2 o'clock...

until! I followed the calibration procedure in the manual and it made a big difference. it now sounds exactly like what I thought I was getting.

so if yours seems like it's lacking in dynamics, give calibration a whirl.

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Post by lewisr7 » Fri Sep 13, 2019 2:45 am

I have a strange experience with this filter and was wondering if anyone else can confirm or deny... (I'm on my second one now so it's not a faulty unit.)

Basically there is weird audible digital noise artifacts present at various point across the frequency range of the filter. Certain cutoff frequencies yield very noticeable spikes in the noise.

It's hard to explain exactly what the noise sounds like but it ranges from digital bleeps and bloops (especially noticeable when cutoff is under fast modulation) to full on squeals when you happen upon one of the spiking points.

At first I thought I could just increase the volume of my input to drown out the annoying noises, but the filter clips before the noises are fully masked by the desired signal.

I should mention that these sound artifacts are distinctly different from the clock sound that is mentioned in the manual, i.e. the sound that occurs when you push the cutoff lower than a certain point.


Does anyone else have any experiences like this? It's making an otherwise beautiful filter a real pain to use.

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Summa
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Post by Summa » Fri Sep 13, 2019 3:26 am

what PSU do you have in your case? Is it a switching supply, they do tend to generate the sounds you're referring to.

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Post by lewisr7 » Tue Sep 17, 2019 12:31 pm

Summa wrote:what PSU do you have in your case? Is it a switching supply, they do tend to generate the sounds you're referring to.
I'm just using the built in power supply on an Arturia rackbrute.

I did think that this must be power supply related but it seems strange that the noises are so tightly coupled to the mum m8s cut off frequency (i.e. spikes at certain cutoffs, changes pitch eratically as you sweep the filter, disappears completely at some cutoffs). I don't hear anything like this with other filters too which is also odd if it's coming from the power supply - admittedly I know very little electronics so I could be missing an obvious connection here.

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michaeljohnson
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Post by michaeljohnson » Tue Sep 17, 2019 4:58 pm

wavefold wrote:can't wait to wreck some amens through it :hyper: :party:
where are those amens then? :hyper:
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Post by honeysmack » Tue Sep 17, 2019 9:49 pm

rew_ wrote:just popping in to say that I'd had this in my rack for awhile and finally admitted I found it a little lifeless—just not a lot "filtering" going on, very little difference it seemed between 10 o'clock and 2 o'clock...

until! I followed the calibration procedure in the manual and it made a big difference. it now sounds exactly like what I thought I was getting.

so if yours seems like it's lacking in dynamics, give calibration a whirl.
I feel the same, and need to go thru this process

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Post by paperCUT » Wed Sep 18, 2019 1:08 am

lewisr7 wrote:
Summa wrote:what PSU do you have in your case? Is it a switching supply, they do tend to generate the sounds you're referring to.
I'm just using the built in power supply on an Arturia rackbrute.

I did think that this must be power supply related but it seems strange that the noises are so tightly coupled to the mum m8s cut off frequency (i.e. spikes at certain cutoffs, changes pitch eratically as you sweep the filter, disappears completely at some cutoffs). I don't hear anything like this with other filters too which is also odd if it's coming from the power supply - admittedly I know very little electronics so I could be missing an obvious connection here.
It's a switched capacitor filter where the cutoff is controlled by a clock's speed. Clock noise is a side effect of these filters.

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Post by lewisr7 » Wed Sep 18, 2019 2:50 am

paperCUT wrote:
lewisr7 wrote:
Summa wrote:what PSU do you have in your case? Is it a switching supply, they do tend to generate the sounds you're referring to.
I'm just using the built in power supply on an Arturia rackbrute.

I did think that this must be power supply related but it seems strange that the noises are so tightly coupled to the mum m8s cut off frequency (i.e. spikes at certain cutoffs, changes pitch eratically as you sweep the filter, disappears completely at some cutoffs). I don't hear anything like this with other filters too which is also odd if it's coming from the power supply - admittedly I know very little electronics so I could be missing an obvious connection here.
It's a switched capacitor filter where the cutoff is controlled by a clock's speed. Clock noise is a side effect of these filters.
Yeah, I fully expected to hear some clock noise but it just seems like something specific about my set up that's making these noises so loud compared to the input signal that they are intrusive. Like I said before any attempts to turn up the input volume to drown out the noise leads to clipping in the filter. I am taking the out of the MUM M8 straight into my soundcard...

I thought the signal being too hot might be the problem but surely this would just make everything loud equally and as such not make the noises any more noticeably loud compared to the input in my case...

I was just wondering if other people had similar experiences... Are you saying this is something everyone experiences? Thanks :)

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Post by bemushroomed » Wed Sep 18, 2019 2:58 am

rew_ wrote:just popping in to say that I'd had this in my rack for awhile and finally admitted I found it a little lifeless—just not a lot "filtering" going on, very little difference it seemed between 10 o'clock and 2 o'clock...
How is the filter supposed to sound, originally though... if that's really how it sound originally then i think i would prefer that over something that borders into something that begins to sound like something else.

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rew_
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Post by rew_ » Wed Sep 18, 2019 8:32 am

bemushroomed wrote:
rew_ wrote:just popping in to say that I'd had this in my rack for awhile and finally admitted I found it a little lifeless—just not a lot "filtering" going on, very little difference it seemed between 10 o'clock and 2 o'clock...
How is the filter supposed to sound, originally though... if that's really how it sound originally then i think i would prefer that over something that borders into something that begins to sound like something else.
I suppose it's possible that ALM went to the trouble of reproducing an affectless filter and that after following the (very simple and clear!) calibration procedure in the manual I just happened to stumble onto a more dynamic but historically inaccurate sound but...I dunno, man, what do you think is more likely.

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ALM
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Post by ALM » Wed Sep 18, 2019 8:59 am

rew_ wrote:
bemushroomed wrote:
rew_ wrote:just popping in to say that I'd had this in my rack for awhile and finally admitted I found it a little lifeless—just not a lot "filtering" going on, very little difference it seemed between 10 o'clock and 2 o'clock...
How is the filter supposed to sound, originally though... if that's really how it sound originally then i think i would prefer that over something that borders into something that begins to sound like something else.
I suppose it's possible that ALM went to the trouble of reproducing an affectless filter and that after following the (very simple and clear!) calibration procedure in the manual I just happened to stumble onto a more dynamic but historically inaccurate sound but...I dunno, man, what do you think is more likely.
All the calibration procedure basically does is set/limit the low end and range of the filter. If set too low then it will have more effect (as in wider frequency range) but will introduce clock noise (a high pitched whine at low cut off). From the factory the MUM M8 should be calibrated so the low end is just above the clock bleed and its not heard - the same as the S950.

The MUM M8 is very much about having the specific 900/950 'sound' (steep cut off, sucking like sound, not fully closing) with some nice additions (resonance, mild saturation etc) rather than being a regular general synth filter with a wide frequency response etc. For it to really shine is tends to need a harmonically rich or complex input.

It could be your unit was mis calibrated from factory, you are not hearing/minding the bleed or you are just feeding it a source it cant really get its teeth into. There is nothing wrong with calibrating it to taste of course - that is what the controls are there for.

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Post by coolshirtdotjpg » Wed Sep 18, 2019 11:32 am

Has anyone compared this with a bionic lester mk1? I’m curious how the few switched capacitor designs stack up.
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Post by sanpa » Fri Dec 13, 2019 1:18 pm

lewisr7 wrote:
paperCUT wrote:
lewisr7 wrote:
Summa wrote:what PSU do you have in your case? Is it a switching supply, they do tend to generate the sounds you're referring to.
I'm just using the built in power supply on an Arturia rackbrute.

I did think that this must be power supply related but it seems strange that the noises are so tightly coupled to the mum m8s cut off frequency (i.e. spikes at certain cutoffs, changes pitch eratically as you sweep the filter, disappears completely at some cutoffs). I don't hear anything like this with other filters too which is also odd if it's coming from the power supply - admittedly I know very little electronics so I could be missing an obvious connection here.
It's a switched capacitor filter where the cutoff is controlled by a clock's speed. Clock noise is a side effect of these filters.
Yeah, I fully expected to hear some clock noise but it just seems like something specific about my set up that's making these noises so loud compared to the input signal that they are intrusive. Like I said before any attempts to turn up the input volume to drown out the noise leads to clipping in the filter. I am taking the out of the MUM M8 straight into my soundcard...

I thought the signal being too hot might be the problem but surely this would just make everything loud equally and as such not make the noises any more noticeably loud compared to the input in my case...

I was just wondering if other people had similar experiences... Are you saying this is something everyone experiences? Thanks :)
I'm having similar noise. Here's a quick demo doing a filter sweep and running Salmple through it at the end. https://soundcloud.com/sexraptor/mum-m8/s-fevR6

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Post by therk » Sat Dec 14, 2019 9:23 am

Having similar problems in a new Intellijel 7u case. Was fine in the old case (with TipTop busboard). Similar issues with a VCF-74, so I'm leaning on blaming the case at the moment, but it's hard to tell :(

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Re: ALM MUM M8 - Akai S950 based filter

Post by sixxdonuts » Fri Jun 19, 2020 12:59 am

I had a good deal of clock noise/high frequency sine on my M8 which I purchased used but the calibration process totally resolved. Now I have my very own S950:) It was also helpful to go through the calibration process as it gave me a better understanding of the full capabilities of this filter. Love that this thing has two inputs!

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Re: ALM MUM M8 - Akai S950 based filter

Post by depaffect » Fri Jun 19, 2020 6:50 am

I would love to know the role of the two trimmers on the back! What does each one do?

I wanted the filter to go lower (quite happy to deal with the clock noise) but I couldn’t work out how to get that without having the maximum cutoff being too low too. Just wanted to extend the bottom, not the top!

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