TubFilter: Altec 9069 MXXX Clone

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Hey everyone. I'm on a spring reverb hunt and realized that filtering it is a big part of the classic dub sound. King Tubby used an Altec 9069 stepped high pass filter and, not having one, I used MXXX to make a copy.
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The default frequencies of 70,100,150,250,500Hz, 1,2,3,5,7.5kHz are good but sound similar to a sample and hold modulation when swept. Since I'm used to assigning specific pitches to EQ points, I added a Tuning Key knob so you can set the cutoff steps to the 12 keys in addition to the original steps.

The keys are simply roots and perfect fifths for maximum compatibility. If you're not used to this, try setting the key to your song, a whole step below, or even to other scale degrees like the perfect fifth or fourth. Heck, put it at a tritone if you want. The difference is subtle but the sweeps sound more harmonic than the default to my ears. Should you want to fine tune the frequencies, you can toggle the Continuous button at the bottom.

Though I didn't make a full custom gui, I did take the time to assign MIDI. Your mod wheel and CC74 go to cutoff, Expression and CC71 go to resonance. Finally CC70 sets the key.

Although the Altec used a third-order (18dB/oct) filter supposedly, I think this is close enough. It's definitely better than not having it at all. Try it on a spring reverb return either before or after the reverb. Rasta!
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Very cool. I get the tubby touch. Praise Jah
Last chance

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Tyrs wrote: Tue Nov 16, 2021 7:25 am Very cool. I get the tubby touch. Praise Jah
Thanks, Tyrs. Your comment made me think of "Rastafari Anthem". Here it is in case anyone hasn't heard it. Don't think he's using an Altec here but still a jam.


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