[Sokol1]

I cannot get the Rich-lean mixture to work. Have assigned key 9 and 0 to lean and rich. No effect. I try to use mouse pointter-click...No effect. Yes, I am set in Realism Options for CEM. All other controls work, with keys or mouse clicks.

you are using old CloD version?

Also, on another matter, the Wiki manual for Spit talks about Boost settings. Could someone explain how, when, why one should change "Boost" settings? In Controls, there is a "Boost Cut-out" Key option,...

This control "Boost Cut-out" should by called: "Boost Cut-out off".

Boost Cut-Out (off): ON - disable a compressor relief valve that allow you use additional manifold pressure for limited time.

Boost Cut-Out (off): OFF - enable the relief valve that limit manifold pressure at safe values.

Think that you can see this like il-2(1946) "WEP".

and also several "Slow-running Cut Out" key options. I can find no explanation of those functions/keys.

This command is to properly shut down the engine(s).
Press and hold until engine is turned off.
Optionally you can use only "Slow-running Cut Out" instead for engine #1, #2... in multi-motor planes select engine 1, 2 before use "Slow-running Cut Out".

Sokol1