Low Engine Sound

Why would the engine sound of one plane be very low? It hardly changes with the throttle. It acts like it’s not using the Sound folder at all.

What plane?

I’m trying to get the old Cirrus working by putting it in my Community folder. I have one missing texture on the panel, and very little engine sound.

Do you see both versions in the sim, where you choose your plane?

yes I do see both versions. I can choose the old plane, but the engine sound is really low.