Winamp, force mono output

29 09 2006
In the options menu open the preference windows (press Ctrl + P), on the left pane scroll down to DSP/Effect and select on the right pane Nullsoft Signal Processing Studio. Click on the Configure Active Plugin button, click New, give a name to the preset , check Enable Processing and in the field Per Sample (or sample pair) write:

If you need both channels on the right side


If you need both channels on the left side


Save and close
winamp_ references
Winamp Preferences.
winamp_ references
Nullsoft Signal Processing Studio



24 responses to “Winamp, force mono output”

29 08 2008
Drew (07:51:18) :

Thanks man, this is the only useful information on the subject I have found so far.


Jual vans authentic full black Reply:

this is the only useful information


17 10 2008
Paul (05:01:39) :

If you want the same signal through both channels set it to this: spl0=(spl0+spl1)/2; spl1=spl0;


Caleb Reply:

I want the same signal through both channels. Thank you. I use this (spl0=(spl0+spl1)/2; spl1=spl0;) because it is what I was looking for. Sometimes I’m irritated by stereo, monaural music feels more symetrical.


22 04 2009
rob guest (21:25:18) :

that’s a great help, thanks!


25 04 2009
Sminster Dome (15:36:43) :

I don’t know about you guys, but the code did not work for me. Doing a little experimenting-&-testing I came up with a revised version of it, and it definitely works in my case. (first, remember that “spl0” & “spl1” are: “SPL0” & “SPL1″…NOT: “SP10” & “SP11”–the LETTER ‘l’ is often confused with the NUMBER ‘1’…[but the zero is always a zero]) ENTER THE FOLLOWING–character-by-character with no spaces & always ending each line with a semicolon: spl0=spl0; spl1=spl1; mono=((spl0+spl1)/2); spl1=mono; spl0=mono;


John Reply:

Thank you!! This worked, after fucking around for ages and many pages trying to find a proper solution to this problem you give me an answer! Thanks =D


Monk Reply:

One more thing – this thing doesn’t work on MIDI-files. Nothing seems to work, not even the “force mono”. So if a MIDI-song has the bass on the left channel only, there’s no way to make it sound from both channels.. listening to something like that with earphones, argh. Does anyone know any trick that would work with MIDI-files also?


15 06 2009
Jason (12:07:07) :

Great stuff mate. Worked like a charm and the images made it bullet proof!


4 08 2009
Jon (19:50:36) :

Try this: Winamp : Preferences : Playback : Force Mono


21 04 2010
marco (10:07:20) :



1 05 2010
Vikram (06:48:31) :

Winamp : Preferences : Playback : Force Mono the simplest one.


Francesco Reply:

Right, haven’t used winamp in a long time but few sub-versions ago that wasn’t an option so… 🙂


19 05 2010
Kız giydirme (06:47:07) :

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1 06 2010
Blaine (02:27:45) :

the force mono one is not available in my winamp. but the other method works


28 06 2010
iTzKiRA (08:41:34) :

the ‘force mono’ option doesn’t works for me but this method works, Thanks 😀


25 07 2010
doveris (00:32:16) :

Muchas gracias, me sirvió mucho. Es que me quedé con un solo parlante bueno y necesitaba sonido en mono. Saludos.


22 11 2011
Pablo (21:49:37) :

Works like a charm !!!! 😀 Thanks man


25 03 2012
Monk (18:07:22) :

Thank you for this useful information! Sminster Dome’s example works beautifully – I wanted both channels to play the same signal, and now it finally does! Why? Well.. try to play TFMX files with Winamp (there is a plugin for it) while using headphones to listen to it, and you will know. Amiga has an ‘extreme stereo’, where half the channels exist on the left channel, and the other half on the right channel, so using headphones with Amiga music without some sort of forced mono is torture. I know it has the ‘enable stereo blending’ option, but that only improves the situation slightly, it doesn’t completely do the trick. But the information on this page does – thank you all, especially Sminster Dome! – Monk


27 07 2012
Bertex (14:10:04) :

O tak pjn to kompletna porazka!


24 12 2012
Jader (20:19:14) :

exelente!!! resolveu a questao de deixar mono, o som das duas caixas saindo em uma só e voce ainda escolhendo em qual lado irá sair! Greeeeat solve my problem with let the sound goes mono in only one soundbox


10 04 2013
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6 05 2013
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31 07 2013
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