Sound issues, duplicated and fixed. The missing and clipped sounds were due to the percentage of volume.
For bombers, I found that any "your engine" sound less than 45% entirely disables the engine sound.
For GVs, I did not test the "your engine" sound less than 45%, but at that volume it works properly also.
For the flaps sound, I found that any "actuators" sound less than 9% was clipped, and works properly at the higher volume and above.
Edit: I have since noticed one occurrence of the clipped flap sound since volume increased to 9%.... possibly a higher volume setting is more stable.Sunny1 suggested that I ditch my beautiful Ki61 over town and take a look at the debris. I was glad I did. He noted that running into debris had physical effect on vehicles...... THIS IS WAY MORE THAN EVEN I WAS EXPECTING.....