I-ō47 Multimode Resonator/Filter is a modern take on a vintage circuit design inspired by the classic 1047 module of the ARP2500. It has been designed with some extra features and quirks built in.

The internal VCA’s are a new hybrid design of matched transistors and precision op-amps.

With CV controllable centre frequency, resonance/Q and notch offset along side FM, strike and a complex dual input with wave shaping limiter, the I-ō47 is truly a filter for all occasions.

I-ō47 | ʌɪ-əʊ-ˈfɔːti-ˈsɛv(ə)n | noun (signal processing) the in’s and out’s of a classic multimode filter/resonator

Das Belgrad ist eine analoge Multimode-Schaltung mit variablem Grundsound und ganzen zehn Filter-Charakteristika. Zwei mehr oder weniger unabhängige Resonanzspitzen machen, neben klassischen Frequenzbeschneidungen, auch ungewöhnliche Ergebnisse möglich. Hierunter fallen zum Beispiel Formant-Klänge.

The MCFx2 is our state variable ‘MCF’ filter made double. It features 2 identical classic analog 3 pole filter cores each with Low, High and Band Pass (or Notch) outputs. Direct and voltage control is provided for both filter cut offs and resonance.

A DUAL MULTIMODE FILTER…

A CV-controlled overdrive circuit capable of wavefolding.

A clean 12dB/octave multimode filter self-oscillating cleanly across the audio range.

Times two. And this could have stopped here.

Following in the tradition of Evolution and Morpheus, LINNAEUS represents yet another Dave Rossum innovation in filter technology.

Filter 8 ist eine voll spannungssteuerbare OTA-Multimode-Schaltung, die man auch als Acht-Phasen-Sinusoszillator, VC-LFO oder Percussion-Stimme verwenden kann.

 Erica Synths Black Polivoks VCF is one of the most authentic sounding emulations of the famous Russian synth the Formanta Radio Factory Polivoks.

C4RBN (pronounced "Carbon") is a 4/2-Pole State Variable Filter with input saturation, output wavefolding, and more.  It features a wide range of character from nice and clean filter sounds to screaming, squelchy, acidic mayhem.  

The Fusion VCF3 is resonant 24dB/oct lowpass filter of unique design that combines vacuum tubes and vactrols, providing distinct, soft filtering. For more versatility, the independent audio mixer and buffered multiple is incorporated in the module, and, most importantly – a CV recorder that records motion of the potentiometer, so you can design advanced modulation patterns.

Das Z2040 ist das diskret nachgebaute Tiefpassfilter des Prophet 5 mit ein paar extra Features wie spannunssteuerbarem Gain und Resonanz. Der Gainregler erlaubt das Übersteuern des Filters.

24dB resonant lowpass filter and distortion with internal modulation and envelope following

A-105-4 ist unser erstes polyphones Filtermodul und in erster Linie für polyphone Anwendungen gedacht. Das Modul beinhaltet vier 24dB-Tiefpassfilter vom Typ SSM2044/SSI2144 mit gemeinsamen, manuellen Bedienelementen und Steuerspannungseingängen für alle Parameter.