Instead of 50/50 I want 100% on the left side of my headphones. How can I do this?
My OS is Debian Squeeze, and the laptop I have is a Thinkpad T61.
Assuming you're using alsa, you can do it with something along these lines in
I am basing this on http://alsa.opensrc.org/Talk:.asoundrc#Converting_stereo_to_mono_sound, there are a bunch of other examples there too.