#113

ah sounds cool, I’ll have to try something like this with an er-301 delay line.

1 Like
#114

I’m considering picking up a passive matrix for use primarily with Eurorack audio signals. For those of you that use it for this purpose, what sort of limitations does this pose compared to an active mixer other than audio signal drop? (…and does this audio signal drop impact possible feedback routing?)

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#115

i think a lot of your q’s will come more to use case scenario, which mixer device used. the one i have works for softer sides of feedback but begins, in an interwoven set of connections, to affect anything connected (ins and outs). feedback itself is often so volatile in nature that it is very hard to predict results without trying out the ideas with the given hard/soft setup.

so, i use my passive 3x3 matrix pretty when i want a simple dirty mixer when i need an funky mult or to otherwise inject some unexpected oddity into a patch. weird stuff happens, even turning up or down unconnected channels.

they are cheap and useful to have around but if you want repeatability and precision in the feedback i wouldn’t rec a passive matrix. if you like to add spice and have machines messing with your mind then a passive matrix will be fun.

the one i use is an old repeater elec 3x3, i can only imagine others may behave differently so ymmv.

i definitely say try one and see if it fits your feelings

3 Likes
#116

5x5 diy matrix mixer I just completed work on:

33 Likes
#117

did this ever come to fruition? would like to try something similar myself…

#118

Yeah I made a couple iterations of it but my CPU usage was crazy high so I never got around to trying it out. The problem was that I had a really complex control surface using the 16n where every fader controlled either the gain or the delay at each node; there were two “pages” of faders with soft-pickup so the values wouldn’t jump. I should try again but less fancy.

#119

It’s a crying shame the promodular stuff came just a bit early maybe https://www.modulargrid.net/e/modules/browser?SearchName=&SearchVendor=115&SearchFunction=&SearchSecondaryfunction=&SearchHeight=&SearchTe=&SearchTemethod=max&SearchBuildtype=&SearchLifecycle=&SearchSet=all&SearchMarketplace=&SearchIsmodeled=0&SearchShowothers=0&order=newest&direction=asc
I use 3 of the miiix and am about to get the insert and master. The quality is beyond anything I’ve seen in euro

#120

DIY active Matrix Mixer, 8 Inputs, 5 outputs

looks like I have a problem with Instagram embedding? Link works, but no picture here
Matrixmixer 8*5
The four separate pots are not yet connected.
#matrixmixer #sdiy #synthdiy #noise #darkambientmusic #noaudienceunderground

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image784×1045 300 KB

5 Likes
#121

just want to congratulate you on what looks like a great DIY Serge/CGS system! sounding great, too.

#122

thank you very much!

#123

How’s the audio quality of the 4ms matrix mixer? I’ve encountered mixed opinions online.

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#124

I don’t think I have a very discerning ear so I probably wouldn’t listen to me, but I thought it sounded alright. I ended up selling it cus I just couldn’t justify the cost(and realized I don’t need/know what to do with 16 vca’s :sweat_smile:)

#125

For what it’s worth, mine sounds amazing and will soon be joined by a second.

#126

anyone else have any experience with the doepfer
a-138m?

#127

Yep, it’s great. Mine is in constant use.

1 Like
#128

I use it mostly for audio, routing FX chains. It’s a simple modul and it works fine. I wishes sometimes to have more channels or get a secound one. Stereo would be nice to…

2 Likes
#129

yeah stereo would be truly amazing

#130

Yep, I often use it for CV mixing, nice touch are the uni/bipolar switches, I sometimes flip them as a quick way to get “something else”, more often than not the results are rather useful. :wink:

3 Likes
#131

Do you or @Jonny have any pointers for DIYing, like schematics, op amp choices, etc?

I’d like to find a 4x4 (or 6x4) stereo* matrix mixer, and suspect it’s a unique enough thing that I’ll need to DIY it.

The best resource I’ve found so far is https://sound-au.com/project129.htm, but I’m really confused why the pots should be linear and not log.

*”stereo” meaning, 4x4 would actually be 8x8 channels, but with 4x4 dual pots

#132

I looked at that site and the Mickey Delph and Lowgain Electronics designs. Btw, the pot wiring diagram on that linked site is backwards if I recall correctly.

They all use linear pots, so I went with that, but I’m not sure exactly why that’s the standard case. These passive designs are somewhat primitive and can be noisy or prone to impedance mismatches, so that might have something to do with it. I guess one benefit would be mixing CV signals if you wanted to.

I would not want to build a stereo (passive) version. The larger your passive matrix, the noisier and more lossy it’s going to be and you’d also need to have higher levels to drive it. Personally, if I were doing it again, I’d buy the Low Gain PCB or design one similar to avoid all the wiring which is a real pain.

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