You are not sending a stereo signal into mc6 ( like a synthesizer that outputs L & R channels but also can send only the left channel in also and in mono) but only a single channel in (mono) and in all cases that would be the left channel only. The track defaults to a stereo signal to send into it, but it can be either left, or right, or stereo by setting the input to what you are recording in and or mono as mentioned in the previous post.