adobe audition channel issues

I use version 3.0, is just the beginning of the recording are the two-channel.But all of a sudden turn into a time when a mono recording, how are adjusted to no avail.That is, if the channel is a stereo input, Recorded voice out there is only one channel.
Also, when multi-track recording a time when it was the voice of the other tracks are recorded together into a ~ ~! ! Of course, other tracks can be switched off, so it is feasible or how to record songs ~
invite an expert to spirit

I will not
line, but some people have not seen for a long time.
I
one of the first stem-channel recording to sing (who sing)
in another channel and then into the accompaniment
Another channel in the synthesis of mono, a microphone to confirm if there is no problem, it is estimated that in the multi-track when the track with the sound of an error caused by the setting, with 3.0 sound adjustment method is relatively simple, multi-track interface, each The two tracks are able to adjust the knob (on the left side of the sound track that shows a few of the window following the two knob), which is on the right side of the knob adjustment phase of the sound, under normal circumstances, with the sound can be transferred into a 0 .
As for the multi-track recording, you look at the situation should be to set up your voice input has become a stereo mix, double-click the system tray of small speakers, sound recording in the box only to select a microphone will be able to open the AA ( adobe audition), Option-point, point “windoS recording console”

election only MIC microphone,

you change the mono recording, in fact, does not matter, because you pick up the microphone Is the mono's.

You recorded after the new track at the point right point into the election of the new track stereo

Or, you sound track (multi-track mode), There is a -> (right direction of the arrow) point to choose stereo