Turning-off internal sound is recommendation of musicians community for working with audio-sequencer (Reaper for instance). 

Okay, but did that help your FS2Crew issue?

 

No, that didnt. I described status (settings) of my system. Int.sound is off always (many years).

You think it makes sense to turn on int.sound and watch?

It wont hurt to try.

 

 

okey, I'll try. But I wonder why the bug happens after about 2h40min? Not earlier... not right away....

I don't know....  all I can think of is your hardware is someone disconnecting/ going to sleep.

 

Lets think logically. From where fs2crew receives voice-signal? from windows speech recognizer? or from hardware input directly (through default recording device)?

I have news. I have made flight with only internal sound device, external usb device was off completely. I didnt meet the problem. But I had FPSs drop and bad working of sound system overall. VPilot for instance worked intermittently, windows' sounds were in the same way (sounds of user account control for instance). The reason may be in the drivers for int.sound.  And else there was very bad preamping of mic.signal, nevertheless m-audio is better for preamping.

Its only the experiment. I want to return to M_Audio using. But need to locate the problem.......

11 hours ago, MOSSS said:

Lets think logically. From where fs2crew receives voice-signal? from windows speech recognizer? or from hardware input directly (through default recording device)?

FS2Crew receives audio input via the microsoft speech recognizer.

The only way I can reproduce this is if I physically pull my USB headset out of it port then stick it back in.