Mailbag #9 - Behringer 904A low pass filter

Just got the Behringer 904A low pass filter module for my eurorack setup. It's based on the Moog modular 904A module and is a faithful recreation. Video goes through a little discussion and then a quick first listen.

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[ranzee]

I decided to use the Make Noise Maths as an EG (envelope generator) because the 904a lacks an attenuator on the control inputs (the Maths has one for each of the 4 outputs). Although you can see me wiggling the knobs on the Maths - the effect is purely on the output of the 904a filter. Heck, there's a lot more we can do and show - this is just the first look. Let me know in the comments here what you would like me to try/show - and I'm happy to do some follow-up video(s) - this may also include me running it through my oscilloscope :)

[AndyVonal]

I wondered about this one, myself... still might. This Eurorack thing takes us into unexpected places! Cool sounds!

[supercompooper]

904a is my fave filter. The Modcan 5U implementation is super bonkers good. This one is pretty good too. The bass from it has blown many a speaker driver 🥺🤪

[josehaya]

Nice! Does it has the same hizz “problem”?

[lordlollops]

So does the low pass filter give a punchier sound when closed and longer sound when opened ? Sorry im a newb to Eurorack

[laksman]

Hello!
I have a question,
I have a complete system 55, when I put a Cv to the control input of the 904b and I get a note in the regeneration frequency (Almost sine wave) I try to tune the entire scale. but my 904b doesn't follow. The entire scale falls short, 1 and 1/2t almost below the octave. I have tried different CV sources.
I don't know if I should do the entire scala in tune. Like Key tracking.
Could you help me with your experience?

Thanks!!!

[apislapis]

That Frequency Range has quite a nasty click when auditioning with headphones, Ranz. Is that normal?