Like the Minimoog, Oberheim‘s OB-X, OB-Xa and OB-8 are among those analog synthesizers that have the most software replicas. It’s no wonder since these three polyphonic synthesizers from the early eighties wrote music history with their warm and voluminous sound and still enjoying great popularity today.
Purist with Add-ons
For Obsession, Synapse Audio used the OB-Xa as their model, using Curtis chips for the oscillators and the filter. The layout with two oscillators, noise generator, resonant filter, two LFOs and two envelopes is well known from its hardware counterpart. In both oscillators, you can select sawtooth, square, a mix of both, and triangle waveforms. In Sync mode, you can create wonderfully cutting sounds. Fortunately, there is also a cross modulation option onboard, which (in hardware form) was reserved for the…