QMMP : Configuring Effects Plugins (LADSPA)

[h3kt0r]

Experimented a while with effects plugins for QMMP and found some ways to fine-tune the sound output.
Sure, you could use "Pulse Effects" but in my case, it didn't work well, so...
Here's my take to squeeze some juice out of QMMP !

First, if you're using a DAC, you may want to configure your pulse server adequatly.
I'm using a "SoundBlasterX G1" USB sound card. It can play audio up to 24-bit / 96 kHz.
So i've modified the configuration file for the pulse server this way :

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open a terminal :
vim /etc/pulse/daemon.conf

Add to the end:
--------------------------------------

default-sample-format = s24le
default-sample-rate = 96000
alternate-sample-rate = 44100
resample-method = soxr-vhq
avoid-resampling = yes

--------------------------------------

then run with your user (not with sudo or as root):

$ pulseaudio -k

With this config you should be able to use your dac with a 24b/96kHz rate.

For resample-method: to find out what's available you can run pulseaudio --dump-resample-methods

Then, if your equalizer is on, turn it off and :

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Qmmp Settings > Audio > Output bit depth : 24
Qmmp Settings >  Plugins > SoX Resampler Plugin > Sample Rate (Hz) : 96000
Qmmp Settings >  Plugins > SoX Resampler Plugin >  Quality : Very High

Next :

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Qmmp Settings >  Plugins > Extra Stereo Plugin > Effect Intensity: 2.5

And now, the LADSPA plugins configuration :

Add "ZaMultiCompX2" to the list and input values :

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Attack1 99.60
Attack2 99.60
Attack3 99.60

Release1 300.00
Release2 200.00
Release3 150.00

Knee1 7.95
Knee2 7.95
Knee3 7.95

Ratio1 5.10
Ratio2 3.10
Ratio3 3.10

Treshold 1 -16.00
Treshold 2 -24.00
Treshold 3 -24.00

Makeup 1 4.00
Makeup 2 3.00
Makeup 3 6.00

Crossover freq 1 250.00
Crossover freq 2 1400.00

Check all ZamComp boxes.
Check All Listen boxes.
Check Detection (MAX/avg) box.

Master Trim -2.00

Next, add "ZamDynamicEQ" to the listbox and :

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Attack 80.00
Release 120.00
Knee 8.00
Ratio 4.10
Treshold -24.00
Max Boost/Cut 6.00
Slew 1.00

Check High Shelf box.

Detect Frequency 5000.00
Target Frequency 5000.00
Target WIdth  2.05

"ZamAutoSat" & "Declipper" don't have any options you can configure, just add them to the listbox and next :
Add "Smooth Decimator" to the listbox.

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Resample Rate 96000.00
Smoothing 1.00

And finally :
Add "Limiter Stereo" to the listbox. (from the LSP - "Linux Studio Plugins" package)

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Check the Gain Boost box.
Lookahead (ms) 2.00
Attack Time (ms) 2.00
Release Time (ms) 6.00
Oversampling 4.00
Dithering 0.00
Stereo Linking 100.00

This config sounds good to me.
Perhaps it's imperfect or bogus, let me know, your comments are welcome !
If you know some tricks to configure LADSPA plugins, start posting below, i've opened this thread for this purpose entirely...

[Eadwine Rose]

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