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There are 4 separate modules: 1. MIDI to CV, 2. VCO, 3. VCF and 4. VCA. There are many additional features included in each of these modules that make them very functional and flexible. Altogether, there is an equivalent of 15 separate modules combined within this synth, which include 2 voltage controlled oscillators, one of which can be switched to an LFO, 2 voltage controlled filters, 2 voltage controlled amplifiers, a balanced modulator, a mixer, a noise source, 2 A-R envelope generators, 1 ADSR envelope generator, MIDI to CV converter, glide processor, CV scale/offset processor and an external class II power supply."
Pics of the inside below.