Hello everyone. I'me new costumer here. I have recently installed sonar x3. I have TASCAM US-122MKII sound card. Now what the problem I have. 

1. When I record something with that sound card like this. 
 
2. Then when I want to record another voice with hearing the first recorded voice in my earphones, it appears that the second track records my new voice but also records first tracks voice on the left side. Look..



Please help me, If you know how to turn off this, so that i could record another track with stereo.
If you can, post some image or video tutorial to solve this problem. Thanks.
 

Welcome to the forum.
 
You are recording mono source on a stereo track, that's when the signal is only recorded on the left side.
Track 1 does look like the material on both channels is identical, though, and that's weird, if you have recorded both tracks exactly the same way, same mic etc.
Mono sources, like microphone, guitar etc. should be recorded on a mono track.
The picture doesn't show what's the input of track 2.
 
What kind of a microphone are you using (not a USB-one??)?

I have plugged behinger mixer in TASCAM... 
The track 2 is also recorded with the same way as the other one but .. Actually my problem is that I want the SONAR X to record only microphones sound, it records computer sound too. I don't know where to turn off it from.. That's it.

Gogigunia
I have plugged behinger mixer in TASCAM... 
The track 2 is also recorded with the same way as the other one but .. Actually my problem is that I want the SONAR X to record only microphones sound, it records computer sound too. I don't know where to turn off it from.. That's it.

What do you need the mixer for? Are you recording more inputs simultaneously than there are inputs in the soundcard?
What do you mean by "computer sound" that is recorded. Do you mean the previously recorded track or computers own microphone? The PC microphone can be disabled in the Windows mixer.
Are you using newest ASIO drivers for your soundcard and do you have ONLY Tascam selected for use in the Preferences dialogue? Make sure the integrated PC soundcard is not selected for use.
 
What kind of microphones? What are you recording?