@Supercolor_T-120 I did a comparison between the Mk.I which uses YM2612 and Mk.II YM3438 version of the MEGAfm in the MEGAfm thread which might be helpful.
My experience of the OT learning curve so far is that it will definitely stymie you at first when you try to do some basic things, but the more you repeat the same actions in different contexts the less mysterious it seems, and the fog soon clears. Maybe this is an obvious tip but I recommend not spending too much time with constructing a rigid live set at first, but keep trying stuff out, tearing it down and then rebuilding it.
Like because of the way I intend to use it for very improvised live stuff Iāve been constantly changing what tracks do, where they record from etc, and changing out FXs a lot rather than doing a lot of pattern creation and getting too invested in a particular set of samples. So because I keep tearing down and recreating and reimagining how I might use the OT Iām starting to get pretty fast at setting up a track to do something, much of the friction that gets in the way of making music just goes away and the flexibility and power of the device becomes a joy to experience.