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Replica of the legendary Oberheim filter classic, extended by two filter modes and useful CV options.
Even if the Oberheim OB-Xa only appears briefly in the video for "Jump" and the late Eddie van Halen doesn't touch the filter on the unit (not even during the solo excess in the C part), this filter set standards for years to come.
The OBXa-predecessor OBX already established the famous Oberheim sound with its discrete 2-pole filter in 1980. The change to the circuit design based on the "Prophet" chip CEM3320 with two switchable filter modes (12dB SVF/24dB) then resulted in a more direct sound than the OBX. Nevertheless, the buttery-sweeping trademark character could be maintained, paving the way from later Oberheim classics like Matrix 12 and Xpander to synthesizer legends.
An extended adaptation is now available from G-Storm Electro, based on AS3320 chips and adding some features to the original: the two original filters have been extended by two more options (1-pole lowpass and 1-pole SVF bandpass, respectively).
The module has two mixable input jacks that start to overdrive from 12 o'clock onwards. Weaker CV signals can be boosted via the CV-1 knob, while filter resonance goes into self-oscillation and can be controlled via the CV-3 knob. Filter tracking is controllable via the V/Oct-calibrated CV-2 input, making the XaVCF function as a sine wave oscillator. Unlike other recreations of earlier filter classics, the low-end doesn't thin out at high resonance settings, bringing that fat creamy Oberheim sound directly to your case.
