, I couldn't repeat your problem. All I tried to record recorded well. Nothing was lost.
My tests: I call from X1 to K750 and start recording.
1) I speak to both phones in the same time.
2) If there is anyone at home to help me in testing I give one of phones to him and we speak in different rooms. Otherwise I go with first phone (one of two) to another room, leave it there, talk something. Then I go back to second phone and speak there. After record stopped, I analyze results.
After your post I even read book to phone
I still have previous problem after unistalingl beta driver .
what should I do ?
beta driver ruind recording .
Uninstall both drivers and install one of them again. Or simply delete \Windows\wavedev.dll and it will return to the state cooked in ROM.
I wait for more user feedback.