this is a late model odyssey, the darker one.... it has some differences in response in some routings and the ring mod is different but if you select the type III filter from the korg RI its pretty damned close. External audio can be modded by vco1. Can't tell if its FM or RM LOL. Its whacky and cool. No membrane pitch bend. Has the 2600 knob for that. Panel outputs CV etc, No high gain XLR output.Its very heavy compared to the RI due to the case but not too heavy. Eminently giggable its also cool to slave with other synths due to its extensive I/O. Great addition to modular or semi modular rigs needing some Odyssizing.