Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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.

share|improve this question
up vote 2 down vote accepted

Assuming you're using alsa, you can do it with something along these lines in ~/.asoundrc (or /etc/asound.conf):

pcm.card0 {
    type hw
    card 0
pcm.!default {
    type route
    slave.pcm card0
    slave.channels 2
    ttable.0.0 0.5
    ttable.1.0 0.5
    ttable.0.1 0
    ttable.1.1 0

I am basing this on, there are a bunch of other examples there too.

share|improve this answer
+1, This looks promising! – nik Apr 20 '11 at 13:40

Does wmix work for you?

share|improve this answer
I think what the OP wants is to mix L+R into a single mono channel and then route that through just the left output. Does wmix do that? – Majenko Apr 18 '11 at 17:31
@Matt, I don't think it supports mixing the two channels into a mono stream. The Balance/Mute options can be used to turn off one channel. To 'downmix' from two to one channel, one would probably need to use a transcode (like ffmpeg -ac 1), I guess. – nik Apr 18 '11 at 17:35
@Matt, Oops, I think we edited together -- I changed my initial comment where I thought 'balance' control was required to the one above about the time you answered back :-) – nik Apr 18 '11 at 17:39
@nic I thought something like that had happened ;) – Majenko Apr 18 '11 at 17:40

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.