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I have some expensive Shure ear buds with the remote designed specifically for the iPhone... the remote buttons don't do anything. I haven't tried it on CM7 yet, though. I've been running it for quite some time, never thought to give it a shot.
Anyway... this might help... before I bought my Shure's, I did some research on this very subject myself and found that the 4-pin (left, right, mic, ground) headphone connectors don't really have much of a standard. They can be wired any way the manufacturer wants, which is why it's so hard to find something that works with this or that. I found that (at the time I looked into this, which was mid 2009 to early 2010) HTC wires them the same as Apple, but that might have only been on that 1 phone I saw or couple at the time. It really has been a while. I didn't really see if other phone companies have started standardizing this or not yet. (BTW - it may not be so much how they're wired as how the software interprets each connection)
The reason this matters is because the remotes work by sending pulses (like moore's code S.O.S. stuff) and that dictates what the phone should do. If the pulse goes to the wrong connections, nothing happens.
Also, wanted to note, these Shure headphones would let me play/pause/skip/answer calls on my Samsung Moment, but no volume control.
Once again, some of my info might have been mixed up over the couple years since I've looked into it or not even relevant anymore.