Yes, using the PLG150 AN is no walk in the park.
Especially from the front panel.

I have some other hardware analog modeling synths like the Waldorf Micro Q and Novation NOva and editing those two is as easy as it gets. Everything can be done with knobs. May be a couple of shift buttons here and there but that's it.

But even the original n1X wasn't too easy to tweak. So, Yamaha choose to rely on software a bit too much. Oh well, what can we do.

BTW, could you tell me a little bit more about your computer setup?

I know you've been asked this question a lot. I myself (even know a Mac owner) haven't used my PC for music much and lately I've been toying around with the idea of getting my ThinkPad (IBM 3Ghz 512 RAM) to do some synth editing and VSTi soft synth stuff.