Senn Mx580 - Removing Inline Volume Control?

I'm not sure if you have to go through all of that trouble.  I can't say for certain, but I wouldn't be surprised if the MX470 was just the MX580 without the volume control.  I haven't tried it myself, but I do own both the MX270 and MX580.  While the MX270 is inferior particularly where detail and resolution is concerned, the overall difference in performance between the two isn't as large as I would have expected judging by the product numbers.  Therefore, I can't really see the MX470 being too inferior to the MX580 when the "three steps" in between the 270 and 580 aren't that huge to begin with.