I've lost track of who originally asked this, sorry. For headphones with separate controls for each channel, you could do a lot worse than the Sennheiser HD65, currently about £42 from Amazon (or $63 for Leftpondians).
Otherwise, your local friendly TV repair shop should be able to construct a control box to use with your existing phones for very little time and money. -- rgds LAurence <>< ...All that is gold does not glitter; all that wanders is not lost. ---Taglines by Tagzilla (tagzilla.mozdev.org)