What does this variation-button in ambience do? Some EQ-thing? I would suggest, that the button would be changed into a knob. It seems that it has an enormous effect into the color of the sound. I have now spent many hours clicking variation-button trying to find the correct color for the strings. And if I happen to find it, the I realize, that it has almost cut off some other instrument with high timbre or something.. anyway, now, when finding a good variation-number, you have to save it as a preset and therefore save all the settings, instead of writing down the number and later just twisting the knob to the correct number. That's why I think a knob would be better. The number is some random seed, right? Or is it even possible to call for the exactly same preset later with the seed?
And when I still remember to ask: is there a manual for all the function in the ambience reverb? GPO manual said to look for the readme in the ambience-directory, but I found none (only ambience-dll-file there). Nor was there a readme-file.