Trying recal where the iPod button came from, have an i80 F80 dock so think it came supplied as part of this. Perhaps this expains why M were able to licence use of the name on the button.

861v6 ID41, HD621, G98, MC200, DSP7200, DSP7200HC, DSP5500 (rears), D2500; Oppo BDP83, PS3,
- Other rooms 3100, F80