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VC Triple Band-pass Filter Eurorack Module
By Rory Dow

ADDAC603. Size: 22HP. Current: +12V 250mA, -12V 250mA.ADDAC603. Size: 22HP. Current: +12V 250mA, -12V 250mA.

The classic triple band-pass filter has been around a long time. Doepfer and Analogue Systems had them long before the Eurorack explosion. The concept goes at least as far back as 1977, when Korg released the polyphonic powerhouse synth known as the PS‑3300 (now made from pure unobtanium). Korg included something they called the Resonator, which consisted of three band-pass filters which could be tuned separately and modulated with an LFO or envelope. They allowed sounds which couldn't be easily coaxed from the more common low- and high-pass filters (although the PS‑3300 included those too). Vocal tones, formants, more realistic strings, complex sweeps and unique special effects were all easily achievable using this unique combination of band-pass filters arranged in parallel.

And so the triple band-pass has become a mainstay for those looking for filters beyond the norm. ADDAC System's take on it adds some nice touches as well as...

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Published February 2020