Sordina User Guide

Sordina User Guide

A mute is a device a musician can fit to their instrument to change its sound. There is usually a reduction in volume and a change in tone depending on the instrument, the type of mute, and the performer.

A mute works like an acoustic equalizer. By blocking sounds and absorbing energy the mute filters out certain frequencies while allowing others to pass.


Sordina is a VST effect plugin that runs on GNU/Linux, Windows, and Mac OS. It’s purpose is to emulate a wide variety of instrument mutes – currently brass and saxophone.

As with real mutes each of Sordina’s virtual mutes has a different character and responds slightly differently to the input signal they are applied to.

Here’s an A/B comparison of a trombone playing with a real bucket mute and the original un-muted recording being processed by Sordina’s virtual bucket mute.


Please see the detailed installation guide for instructions on how to setup Sordina on your system.

Quick start

Sordina on Ardour audio track

As the plugin is intended to alter the sound of an audio signal it should be placed either after a VST instrument in the plugin chain, on a track containing audio, on an audio bus, or on the master output.

Sordina can be added to a DAW track as either an insert or send effect. This guide will assume it’s being used as an insert.

After the plugin has been added to the audio chain select a mute from the preset browser.


Sordina’s interface

Quick Tips

If you hold the shift key on your keyboard while clicking on a knob you’ll be able to type in a specific value.

You can move the knobs on the interface more precisely by holding down the control key on your keyboard at the same time.

Double clicking a knob will reset it to its default value.

Clicking the Libre Wave logo will display some information about the plugin and provide a clickable link to the website.

Mix & Gain

The Mix knob allows you to adjust the balance between the incoming dry signal and the processed wet signal. To recreate the true sound of the mute on a solo instrument this should be set to 100%. Values lower than this are useful for blending the sound with other instruments and for creative purposes.

The presets that come with Sordina have been volume calibrated against reference recordings but this calibration may not necessarily fit with the audio you will feed into the plugin. The gain knob allows you to adjust the output volume to suit your specific needs.

Frequency analyser & Meters

The window in the middle of the interface displays a real time frequency analysis of the incoming and outgoing audio. The yellow colour shows the unprocessed input signal, while the muted signal is displayed as blue.

On each side of this window is a traditional volume meter. The yellow one on the left shows the volume of the incoming audio while the blue meter on the right shows the volume of the processed output signal.


The knobs marked HPF and LPF control the cut-off frequency of a high-pass and low-pass filter respectively.

Like a real mute the response of the virtual mutes varies depending on the specific instrument being played. The filter is useful to alter the characteristics of the muted sound to adjust for such variations or to sculpt the output audio for a desired result.

A graphical representation of the filter is overlaid on the FFT analyser.

Wah Wah

When a compatible mute is selected the Wah knob will be enabled. This knob can be controlled in real time using host automation to create a live wah wah effect.


All of the knobs will respond to automation messages from your DAW. Check your DAW’s user guide for details on how to access automatable parameters.

You can load mutes on the fly by automating the Presets parameter. You should avoid doing this while audio is playing on the track where the plugin is inserted because it will result in unwanted clicks or pops. If you want to change the mute in the middle of a line you should leave enough silence in the part to avoid this issue.

Preset Browser

Preset browser
Sordina’s preset browser

The browser is divided into three columns. In the left column you can select the instrument you want to mute. For example if you are routing a trumpet recording or a trumpet virtual instrument into Sordina then you’ll probably want to select Trumpet & Cornet from this column. However there are many creative combinations possible by selecting a mute intended for a different instrument.

From the centre column you can select the type of mute. The options available will vary depending on the instrument. See the tables below for more details.

The third column displays the mutes available for the selected instrument and mute type. All of the virtual mutes in Sordina have been created by analysing recordings of real instruments and their mutes*. The names you see in the third column contain the brand of mute that was analysed and either the mute’s model or some other relevant information

Clicking the star icon next to a mute name will add it to your favourites list, clicking it again will remove it. You can see all of the mutes you have marked as a favourite by clicking the larger star icon next to the search box above the first column of the preset browser.

Search bar

You can filter the list of mutes by typing in the search bar and hitting enter.

If you’d like to save any changes you’ve made to a preset you can do so by clicking the Save Preset button next to the search bar.


French Horn

CupHumes & Berg Stonelined
PracticeHumes & Berg Sh Sh
StopHumes & Berg Stonelined
StraightHumes & Berg PhilharmonicHumes & Berg StonelinedThe Warburton Tunable

Piccolo Trumpet

CupTom Crown Aluminium
HarmonTom Crown: Stem In/Out
PracticeJo Ral AluminiumTom Crown Aluminium
StraightDenis Wick AluminiumJo Ral Brass BottomWallace Aluminium

Trumpet & Cornet

BucketHumes & Berg StonelinedJo Ral Brass Bottom
CupDenis Wick Adjustable 1Denis Wick Adjustable 2Humes & Berg Cup 1Humes & Berg Cup 2
Jo Ral TriTone
HarmonDenis Wick: Stem In/OutHumes & Berg: Stem In/OutJo Ral Bubble: Stem In/OutTom Crown: Stem In/Out
MiscFeltHumes & Berg PixiePlunger 1Plunger 2Plunger 3
PracticeBremner SshhDenis Wick AluminiumHumes & Berg Mel-O-WahMute Tube
StraightDenis Wick AluminiumDenis Wick PianissimoJo Ral Brass BottomJo Ral PlasticLeblanc AluminiumPro Tec FiberTom Crown AluminiumAlessi Vacchiano


BucketHumes & Berg Velvet Tone
CupHumes & Berg Stonelined
PracticeHumes & Berg AluminiumHumes & Berg Sh ShHumes & Berg Stonelined
StraightHumes & Berg AluminiumHumes & Berg Stonelined


BucketHumes & Berg Bucket
Humes & Berg Velvet Tone
Jo Ral Aluminium
CupHumes & Berg Mic-A-MuteHumes & Berg Cup 1Humes & Berg Cup 2
Jo Ral Aluminium
Denis Wick Cup
HarmonHumes & Berg Wa-Wah: Stem In/OutJo Ral Bubble: Stem In/Out
MiscBuzzHumes & Berg CleartoneHumes & Berg Derby HatHumes & Berg PixiePlunger 1Plunger 2Solotone
PracticeHumes & Berg Sh ShLiberty Practice
StraightHumes & Berg StonelinedJo Ral Brass BottomSouloAlessi VacchianoTom Crown Straight

Bass Trombone

BucketHumes & Berg Velvet ToneJo Ral Aluminium
CupDenis Wick AluminiumHumes & Berg Mic-A-MuteJo Ral Aluminium
HarmonHumes & Berg Wa-WahJo Ral Bubble: Stem In/Out
PracticeHumes & Berg Sh Sh
StraightDenis Wick AluminiumHumes & Berg StonelinedJo Ral Brass Bottom


PracticeDenis Wick Aluminium
Humes & Berg StonelinedJo Ral Aluminium


StraightHumes & Berg StonelinedJo Ral Aluminium


PracticeE-Sax WhisperMMDSax Mute One

*Libre Wave and Sordina are in no way affiliated or endorsed by the manufacturers of the mutes analysed for the creation of this plugin. Their names and trademarks are referenced only as descriptors for the user’s information.


Produced by: David Healey
Demo Audio: David Budimir
GUI Design: David Healey