like this - http://electronicsusa.com/mk1and2.html

What you are after?

Build a simple box with two inputs that you fade between and have the headphones plugged into a single output from the box.

Haha I love how you moan yet at my time of posting its 100% 'No' to your question!

You voted against your own opinion?myxylplyx

[QUOTE="maximusmmii"]"the guy in whose trailer they were jacking off." that seems to be the best way to say it without changing it too much.MagnumPI

It's just butchered. It's not even proper. That's something a foreigner would say while attempting to speak english.

Whose does indeed fit poorly in that context. You would need to re-think this sentence, possibly like this:

The trailer, belonging to ______, in which they were masturbating .

pianist

I would agree with both of these guys, you could change it completely whilst trying to keep it sounding colloquial by saying

'They were jacking off in that guys trailer'.

Having 'in which' doesn't sound like a particularly Beavis and Butthead thing to say, things that are obviously trying too hard to be 'correct' always sound wrong, exactly like how people speak when its their second language or they don't have a full grasp of it. Try and remember the pragmatics when considering 'correct' grammar!