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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Multimedia
Adding a pre-amp to Alsamixer? (Solved with script)
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Disco Makberto

Joined: 07 Aug 2011
Posts: 141

PostPosted: Mon 03 Oct 2011, 05:14    Post subject:  Adding a pre-amp to Alsamixer? (Solved with script)  

Hello, e-group!

I have read that it is possible to add a pre-amp (pre-amplifier) to Alsamixer in order to boost/increase/amplify the default maximum volume of 100% so as to, obviously, go over 100% in volume. Unfortunately, I haven't been able to achieve this. Thus, does anybody of you know how to do this in Puppy Linux? I am using Puppy Linux 4.3.2 (based on 4.3.1).

On a related note, I have also read that increasing volume is also possible with PulseAudio, but it appears that going the Alsamixer route is easier. So please let's try Alsamixer first....though, as last resort, I wouldn't disregard PulseAudio.

Carlos Albert
D-Makberto

P.S.: Sorry, I think that I posted to the wrong forum. So, moderators, please move the message accordingly. Again, please excuse me.
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 11165
Location: Arizona USA

PostPosted: Mon 03 Oct 2011, 08:46    Post subject:  

This forum is as good as any. I don't know the answer to your question, but a program called Retrovol may help.
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Disco Makberto

Joined: 07 Aug 2011
Posts: 141

PostPosted: Mon 03 Oct 2011, 10:16    Post subject:  

Hey, Flash!

Thanks for your support.

Retrovol comes as default on Puppy 4.3.2 "Puppy 4 Forever". Unluckily, Retrovol doesn't go over the 100% volume maximum.

Carlos Albert
D-Makberto
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 11165
Location: Arizona USA

PostPosted: Mon 03 Oct 2011, 15:25    Post subject:  

Are you trying to solve a problem such as low max volume, or are you just fooling around? Smile
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Disco Makberto

Joined: 07 Aug 2011
Posts: 141

PostPosted: Mon 03 Oct 2011, 20:24    Post subject:  

Flash, this is actually possible, even system-wide. A pre-amp to Alsamixer or a configuration on PulseAudio do the trick, at least this has been reported, though on other distros and not on Puppy Linux. The problem arises when one has a sound file (or video file for that matter) that is too low even at full 100% volume level. Of course, normalization and stuff can be applied, but adding a pre-amp to Alsamixer is easier and faster, at least as a temporary solution.

Now that I think about it, please let me give you one of the links dealing with this pre-amp issue:

http://tinyurl.com/3pnmduu

Do you know how to do this on Puppy Linux? I tried, but I was unsuccessful.

Carlos Albert
D-Makberto
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 11165
Location: Arizona USA

PostPosted: Mon 03 Oct 2011, 22:06    Post subject:  

I think the difference between the line-in input and the mic input amounts to a pre-amp. Have you tried plugging the input into the mic jack to see what happens? You may have to mess around with the settings in Alsamixer to make it work right.
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Disco Makberto

Joined: 07 Aug 2011
Posts: 141

PostPosted: Tue 04 Oct 2011, 01:46    Post subject:  

Bingo!

I was finally able to add a script (mentioned on the link of a previous post) and install a pre-amp to alsamixer, and everything works as intended. Even so, I am not really convinced of the real value of this pre-amp. While the audio files that were low now have a louder sound becoming sort of "normal", this has introduced clipping to the audio files that had a normal volume beforehand. I have played a little bit with different parameters, but I still haven't been able to find the "sweet spot" by virtue of which most everything are supposed to be acceptable, and frankly, I don't know if it would be possible. One way or another, I will report back once I take a final decision.

For the interests of those who might benefit with it, here's how you do it in Puppy Linux:

First, open Geany (Menu -> Document -> Geany text editor). Then, add the following:

pcm.!default {
type plug
slave.pcm "softvol"
}

pcm.softvol {
type softvol
slave {
pcm "dmix"
}
control {
name "Pre-Amp"
card 0
}
min_dB -5.0
max_dB 20.0
resolution 6
}

Afterwards, save this script, name it asound.conf , and place it inside the etc directory (click on the File icon on desktop and look for etc folder). Next, re-start the Alsa sound wizard (Menu -> Setup -> Alsa sound Wizard) and follow instructions. Finally, to see the new pre-amp, open Alsamixer (Menu -> Multimedia -> Alsamixer audio mixer). And to control it, use the right arrow key on your keyboard and, once on the pre-amp, use the up or down arrow keys to change values.

Carlos Albert
D-Makberto
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Disco Makberto

Joined: 07 Aug 2011
Posts: 141

PostPosted: Fri 07 Oct 2011, 06:10    Post subject:  

Hi, again! I have decided to use VLC as such can control volume up to 200% and can be used with specific files only and not system-wide. Notwithstanding, for those of you who, for instance, have an overall low volume as is the case with some laptops, I am sure that adding a pre-amp to alsamixer could be indeed useful.

Carlos Albert
D-Makberto
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