i like the idea of it and it’s fun with H6 indeed. I guess we’re going to see quite some sample players in the near future. 
I have checked your drum sampler yesterday and it was working quite well.
I saw two things as possible improvements.
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The 4 waveform screens are partially configured.
To connect the position marker and other screen functions look under sample osc in the parameter section (right middle section of the extended macro editor) and connect the values of the parameters that have the same name to the value fields in the properties section at the left of the extended macro editor, and that should bring your screen alive, and adapt it to the sample startpoint settings. -
I would do the naming and grouping of all parameters, since if you want to add further parameters to you vsti, you’re going to run in having too few space on the GUI to place them and it will become a spaghetti.
That being said. It worked fine.
Maybe you already changed it, so FWIW.
kind regards,
R