How do I install it? Sorry I am a newbie to fubar2000. I liked it but was unable to get 5.1 sound and found this plug-in. But the .dll download does not work for 0.9. Neither does the '7z' file. I am using xp pro sp2.

I tried AT surround. While that works, it alters the sound quite adversely.

1. Extract foo_channel_mixer.dll into your foobar2000\components folder
2. (Re-)start foobar2000
3. Open Preferences (Ctrl-P)
4. Go to Playback -> DSP Manager
5. Add "Channel Mixer" to your Active DSPs

edit:
The .7z file is a GNU-licensed compression archive. You need this or WinRAR for un7zipping.
The .zip file won't work, as it's the version for foobar2000 0.8.3

a) when I choose 6channel in general tab everything works fine. But when I choose 5 channels center-option does not work, center is always off
b) 6channel choosed, but e.g. front-speakers disabled. Then choosing "copy" in upmix-tab: Frontspeakers start playing!

How about a matrix like in AC3-filter?

next two problems I experience with channel mixer 0.9.4 + foobar 0.9.
Soundcard is a Soundblaster Live 5.1 Platinum, kX Audio Driver 3538j
a) when I choose 6channel in general tab everything works fine. But when I choose 5 channels center-option does not work, center is always off

a) This seems to be a "normal behaviour, but buggy interface" case. I think 5 channel mode is intended for 4.1 speaker setups, so there would be no point in sending a center speaker signal, as there is no center speaker. However, assuming this premise is correct, the wrong option is greyed out when selecting 5 channel mode. While the center option is still switchable (but has no effect), the LFE option is disabled.
@skipyrich: Please correct me if I'm wrong.

b) 6channel choosed, but e.g. front-speakers disabled. Then choosing "copy" in upmix-tab: Frontspeakers start playing!

b) When upmix is in "Copy" mode, there are some strange results when experimenting with the channels. For example, switching both left channels off has no effect in 5 or 6 channel mode, whereas with 4 channel mode the left side is muted correctly. In fact, in 5 or 6 channel mode it doesn't even matter at all which channels are switched on or off, with the exception of the LFE.
However, when in "Surround" mode, correct upmix results are achieved with every channel configuration. Channel switching also works perfectly with original 5.1 sources, no matter if it's downmixed (for 2 channel mode) or not.

You're right in case of foobar2000 0.9. In 0.8.3 5-channel mode output is L/R/C/LFE/RL. 
I never tested this mode before...

In other hand, in 5-channel sample sent by Borisz channel configuration is L/R/C/RL/RR. 
Has anyone have another samples or specs?

2Infernus 2Silversight: Thank you for your reports.

• Resampler
• Channel Mixer
• Advanced Limiter

I have the following order (from top to bottom) in my DSP manager:

• Resampler
• Channel Mixer
• Advanced Limiter

Is this order appropriate or better to be changed?

Hi. Do you plan to support new DSP Presets feature, that was introduced in new foobar2000 beta?

And another question: what values should I use for "Rear in front" and "Front in rear"? Should they sum to 1.00 ?? I've discovered, that (on my 5.1 sound system), it's the best when i use smth about 1.6 / 0.9 - but I think I'm doing something wrong

Yes. Works quite well. I think this is a tad better in overall sound as well as complete control over each channel as compared to Creative's CMSS 3D, though I feel Winamp+CMSS is a tad cleaner. But this might just make me switch. Thanks Skipyrich and all who helped. I will try out some further settings later today.

How does Foobar bypass Creative's processing? Even with foo_channel_mixer, if I set 2 speakers for normal stereo, I need to enable bass redirection in Creative Speaker settings. If I set it to 6 ch, I actually need to disable the bass redirection in Creative Speaker settings to get the sub to work.

anyway, my original intention was to ask skipy if the 'front in rear' and 'rear in front' really are supposed to cause saturation (the total gain seems a bit much even at .75 level for both of them).. either that or explain the workings of them a bit better (it saturates at 50% volume on my speakers with them both at .8 while the song with FiR+RiF on 0 it doesn't even saturate at 90% max speaker volume)