Well, the easiest way to check is put up a sample of some waveforms from Osc 1 and Osc 2 separately, across each voice with the filter wide open. (So one with Square wave on Osc 1, Osc 2 set to off, rotating for each voice, then one with a Saw wave on Osc 1, and so on) Then we can check against our own versions and let you know. The mixing of both oscillators happens outside the chip so no point to check there, same with the filter.