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pacmd load-module module-null-sink sink_name=MySink
pacmd update-sink-proplist MySink device.description=MySink
pacmd load-module module-loopback sink=MySink

Modules

pactl load-module module-ladspa-sink sink_name=compressor-stereo plugin=sc4_1882 label=sc4 control=1,1.5,401,-30,20,5,30
pactl unload-module 536870913
pactl list

Compressor

  • ladspa
pactl load-module module-ladspa-sink sink_name=compressor-stereo plugin=sc4_1882 label=sc4 control=1,1.5,401,-30,20,5,30

Description

Good question and I had to follow it up as PulseEffects is not perfect, occasionally crashing when another program (Telegram) sends a notification sound. I couldn’t find a GUI for this so parameters need to be set when initializing the command.

1. Install the package swh-plugins

2. Load the plugin, parameters can be changed but this worked on initial test:

Code: Select all

pactl load-module module-ladspa-sink sink_name=compressor plugin=sc4_1882 label=sc4 control=1,1.5,300,-20,3,1,10

(note - may first need to pactl unload-module module-device-manager if using KDE)

3. Open Pulse Audio Volume Control and switch the playback sink to “LADSPA Plugin SC4 …”

4. Enjoy compressed sound!

The parameters (the control=1,1.5,300,-20,3,1,10 part above) for this compressor are described in Steve Harris’ LADSPA Plugin Docs http://plugin.org.uk/ladspa-swh/docs/la … th\_sEc2.91 :

1. RMS/peak: The balance between the RMS and peak envelope followers.RMS is generally better for subtle, musical compression and peak is better for heavier, fast compression and percussion. 2. Attack time (ms): The attack time in milliseconds. 3. Release time (ms): The release time in milliseconds. 4. Threshold level (dB): The point at which the compressor will start to kick in. 5. Ratio (1:n): The gain reduction ratio used when the signal level exceeds the threshold. 6. Knee radius (dB): The distance from the threshold where the knee curve starts. 7. Makeup gain (dB): Controls the gain of the makeup input signal in dB’s. 8. Amplitude (dB): The level of the input signal, in decibels. 9. Gain reduction (dB): The degree of gain reduction applied to the input signal, in decibels.

For limiting purposes, lower the threshold, try -30 to -40 and increase the ratio to 10 or so. Settings will vary so you may have to experiment a bit.

Most of this was stolen/adapted from: https://superuser.com/questions/162107/ … 114#162114 https://askubuntu.com/questions/31580/i … 4012#44012

There is also description for using TAP plugins including Lookahead Limiter. It’s described for radio use but should be fine for desktop use: https://www.ab9il.net/software-defined- … ssing.html

If you delve deeper into Steve Harris’ LADSPA Plugin Docs linked above you will find several limiters are included in that collection. Maybe another day’s experiment. https://forums.debian.net/images/smilies/icon_smile.gif

Microphones

FIFINE K670/670B USB Mic with A Live Monitoring Jack for Streaming Pod | FIFINE MICROPHONE

Specifications

Type
Condenser
Polar Pattern
Cardioid
Frequency Response
50-15kHz
Sensitivity
-46±3dB (at 1kHz)
S/N Ratio
66dB
Power Supply
5V USB power
Output Connection
USB 2.0
Shipping Weight
1.0 kg