For those seeking the solution, why player 1 allegedly has no microphone:
[...]
Before the microphone to 2 channels must be changed in Windows:
In Windows 7 or 8 (.1) Right click on the speaker icon -> Recorders
-> Double-click on the USB microphone -> Advanced tab -> select "2 channel ..." -> OK
After that, only the above-mentioned adapt and the fun can begin config file!