Hi h.sie,
just download the pdf
http://www.filefront.com/16383685/M....VIIC-1940.pdf/
and take a look at page 84. The air refreshing system is described there. It mentions some additional oxygen devices to adjust the oxygen according to the crew size (p. 85). But to me this part is not fully clear. I can't imagine that they installed more supplies when there were a few guys more on board. Anyway, I think a crew independent mod is already good enough and another version is probably not worth the efforts.
Just to make sure, the new version also takes into account multiple switches between silent running on and off, right? So whenever it's on, CO2 accumulates with rate a and when it's off with rate B?
Cheers, LGN1
Will you also offer the version V15C as a binary difference on your website?