[rollnloop]

Regarding the Channel Map, is it normal to take about a minute or so to load a mission for that map?

it is, this map is the heaviest, texture wise

On the Ultimate SoundMod, some aircraft like the YP-80 and FW190 A-4 don't have an engine sound when I press F3

This soundmod is also somewhat memory intensive, sometimes F3 won't work, but most often it will work. There are also many ways to install this mod, with varying results.