Audio Midi Setup/Audio Devices Ch M (What is Channel M?)

Discussion in 'Digital Audio' started by leerkeller, Jul 23, 2013.

  1. macrumors member

    Nov 1, 2011
    Baltimore, MD
    When you select an Audio Device, in the bottom right corner sub-window you can adjust the level for each channel. The devices I am dealing with are all 2-channel. In the aforementioned corner sub-window I see the expected Channel 1 and Channel 2. In addition to those two channels, there is also a channel M. It is placed above 1 & 2 in the sub-window. I can't seem to find anything in the Apple Documentation for Audio Midi Setup that explains what Channel M is, so I have decided to pose the question to the experts in this forum.

    Thanks in Advance For The Answer,
    Lee Randolph Keller
  2. macrumors member

    Apr 22, 2005
    can you post a screen shot?

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