via this auction
"OSC-03 may look like OSC-01 but is a very different beast inside. Unlike its hybrid brother OSC-01, the OSC-03 uses fully analog technique taken from MFB Synth II model. Three oscillators with all benefits and the typical character of analog construction in a single compact module.
OSC-03 offers a variety of notable functions: Beside a common CV-control voltage for all VCOs, all oscillators can be individually controlled by CV-sources, e.g. by different tracks of a CV-sequencer like Doepfers MAQ-16/3 or the AS Oberkorn. VCO 1 can be synchronized to VCO 3, individually or paired with VCO 2. The same goes for external hard-sync. The additional CV-inputs allow for common and individual modulations.
Three outputs allow for summed and individual audio outputs. A separate outputs carries a digital ring-modulated signal of OSC 1 and 2 (configurable to OSC 1-3 by jumper).
The difference between OSC-02 and 03 is, that the OSC-03 has a digital noisegenerator and an audiomixer.
The module has a width of 80 mm (20 TE)."
