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EasyTAG
EasyTAG is an utility for viewing, editing, and writing tags for your MP3, MP2, Ogg Vorbis, and FLAC files using a nice simple GTK+ user interface. Features include (among others):
  • view, edit, write MP3, MP2, FLAC and Ogg Vorbis tags
  • can edit more tag fields : Title, Artist, Album, Disc Album, Year, Track Number, Genre, Comment, Composer, Original Artist/Performer, Copyright, URL and Encoder name
  • auto tagging: parse filename and directory to automatically complete the fields (using masks)
  • ability to rename files and directories from the tag (using masks) or by loading a text file
  • process selected files of the selected directory
  • ability to browse subdirectories
  • recursion for tagging, removing, renaming, saving, etc.
  • can set a field (artist, title, …) to all other selected files
  • read file header information (bitrate, time, …) and display them
  • auto completion of the date if a partial is entered
  • undo and redo last changes
  • can process fields of tag and file name (convert letters into uppercase, lowercase, ...)
  • ability to open a directory or a file with an external program
  • a tree based browser or a view by Artist & Album
  • a list to select files
  • a playlist generator window
  • a file searching window
  • simple and explicit interface
  • optional Nautilus extension
  • Brazilian Portuguese, Bulgarian, Chinese, Czech, Danish, Dutch, French, German, Greek, Hungarian, Italian, Japanese, Polish, Romanian, Russian, Spanish, Swedish and Ukrainian translation languages
Ecasound
Ecasound is a software package designed for multitrack audio processing. It can be used for simple tasks like audio playback, recording and format conversions, as well as for multitrack effect processing, mixing, recording and signal recycling. Ecasound supports a wide range of audio inputs, outputs and effect algorithms. Effects and audio objects can be combined in various ways, and their parameters can be controlled by operator objects like oscillators and MIDI-CCs. A versatile console mode user-interface is included in the package.
FLAC
The FLAC project consists of:
  • the stream format
  • reference encoders and decoders in library form
  • flac, a command-line program to encode and decode FLAC files
  • metaflac, a command-line metadata editor for FLAC files
  • input plugins for various music players
FLAC has recently joined the Xiph project, which produces other free codecs such as speex and Ogg Vorbis.
Flac-jacket
'flac-jacket' uses raw audio files (raw files are created from data streams) as the source. Based on the filename format, it first creates lossless audio files, using FLAC, and optionally removes the source files if conversion was successful. It then creates a new html page with links to all new and existing .flac files. The html page is regenerated each run, so the listing is somewhat dynamic: you needn't edit the html page just because you removed or renamed a FLAC audio file or altered an artist directory.
Gnusound Heckert gnu.tiny.png
GNUsound is a multitrack sound editor for GNOME 1 and 2. It can read and write many audio file formats such as WAV, MP3 and FLAC. It can work with the OSS, ALSA or JACK audio backends. It provides many different built-in audio processing modules, such as fades in/out, delay, and filters. GLADSPA plugins may also be used for further processing.
Gsequencer
Advanced GTK+ Sequencer (AGS) is intended to use for music composition. It features a piano roll, as well a synth, matrix editor, drum machine, soundfont2 player, mixer and an output panel. Further it has LADSPA, DSSI and Lv2 plugin support. It's designed to be highly configurable. You may add effects to its effect chain; and add or remove audio channels/pads. You may set up a fully functional network of engines, thus there is a link editor for linking audio lines. AGS requires a realtime kernel and ALSA support. AGS uses conditional locks to keep several threads in sync that's why you need at least a preemptable kernel. LADSPA support has been added to version 0.4.2 as well export to WAV. Version 0.5.x brings you first concurrent audio tree processing support. Version 0.6.x is dedicated to accessibility. You might control GSequencer by keyboard. As you move to a note it provides you an audible feedback. Version 0.7.x gives you the benefit of providing the libraries libags, libags-thread, libags-server, libags-audio and libgsequencer. It contains for now an automation editor. Open Sound System (OSS4) and JACK Audio Connection Kit support has been added recently. Now you may configure multiple soundcards. Since 0.7.111 there is MIDI input available. Let you record your MIDI instrument and doing live performance. Version 0.8.x extended MIDI support to import/export SMF. A built-in envelope editor and additional editing functionality like move/crop selected notes. Version 0.9.x added automation editor. Version 1.0.x released implemented sticky controls. Version 1.1.x segmented AgsNotation and AgsAutomation. Version 1.2.x improved audio backend support and improved accessibility by using Atk+ interfaces. Migrated to segmented AgsNotation , Version 1.3.x migrated to segmented AgsAutomation. Version 1.4.x AgsWave and AgsBuffer have arrived in libags_audio.so Version 2.0.x provides new machines AgsEqualizer10, AgsSpectrometer and AgsAudiorec. Wave form manipulation and recording capabilities. Version 2.1.x has got initial OSC content model support. The provided OSC server allows you to do remote control. Version 2.2.x support for GCC builtin vector functions and added complex data type support. Version 2.3.x added new machines AgsFMSynth, AgsFMSyncsynth and AgsPitchSampler. Support for WASAPI. Version 3.0.x added GObject-Introspection annotations. Implemented AgsServer providing basic HTTP authentication using XMLRPC library libsoup-2.4. Added online help browser to view the user manual within UI by using WebKit2Gtk-4.0. Further providing support for AGS-OSC-OVER-XMLRPC and migrated to Gtk-3. Allow the user to perform fast export to audio file with AgsAudiorec. Version 3.3.x provides a new effect processors, the ags-fx engine. All recalls have got a replacement in order to operate with one single iteration per tic. Further the staging program is modifiable. Version 3.4.x implemented AgsSFZSynthGenerator and AgsSF2SynthGenerator allowing you to pitch missing samples. Version 3.6.x implemented AgsGstreamerFile capable of reading common media files using gstreamer. Version 3.12.x implemented composite editor. Version 4.0.x migrated to Gtk4 and libsoup-3.0. Version 4.1.x implemented zoom in PDF manual. Version 5.0.x improved vst3 api reference manual. Version 5.2.x implemented tremolo, vibrato and wah-wah of SFZ and Soundfont2 synths. Version 5.4.x fixed automation editor. Version 6.0.x implemented initial MIDI v2.0 support. Version 6.1.x implemented note 256th support. Version 6.2.x fixed more accurate timing. Version 6.4.x implemented auto-scroll. Version 6.5.x fixed tool dialogs. Version 6.6.x refactored file dialog.
Helm
Helm is a cross-platform, lightweight, polyphonic, and modular synthesizer that runs on GNU/Linux, Mac, and Windows as a standalone program and as a LV2/VST/AU/AAX plugin. It was developed by Matthew Tytel, who also later worked on Vital.

Features

  • 32 voice polyphony
  • Interactive visual interface
  • Powerful modulation system with live visual feedback
  • Dual oscillators with cross modulation and up to 15 unison oscillators each
  • Sub oscillator with shuffle waveshaping
  • Oscillator feedback and saturation for waveshaping
  • 12 different waveforms
  • Blending between 12 or 24dB low/band/high pass filter
  • Low/Band/High Shelf filters
  • 2 monophonic and 1 polyphonic LFO
  • Step sequencer
  • Lots of modulation sources including polyphonic aftertouch
  • Simple arpeggiator
  • Effects: Formant filter, stutter, delay, distortion, reverb
Jokosher
Jokosher is a simple and poweful multi-track studio. Jokosher provides a complete application for recording, editing, mixing and exporting audio, and has been specifically designed with usability in mind. The developers behind Jokosher have re-thought audio production at every level, and created something devilishly simple to use.
  • Jokosher offers a strong featureset:
  • Ease Of Use - Easy to use interface, designed from the ground up. Jokosher uses concepts and language familiar to musicians, and is a breeze to use.
  • Editing - Simple editing with splitting, trimming and moving tools. Mixing Multi-track volume mixing with VU sliders.
  • Audio - Import audio (Ogg Vorbis, MP3, FLAC, WAV and anything else supported by GStreamer) into your projects.
  • Instruments - A range of instruments can be added to a project, and instruments can be renamed. Instruments can also be muted and soloed easily.
  • Audio - Export to MP3, Ogg Vorbis, FLAC, WAV and anything else GStreamer supports.
Kalsamix
'kalsamix' (formerly kamix) is a mixer for KDE and ALSA, with more features than kmix (or at least with more than kmix had when kamix was started). It supports channel splitting, levels storing/restoring, sync with external ALSA events, correct handling of "enumerated" elements, and selective item hiding/showing.
Kwave
'Kwave' is a 24-bit sound editor that allows simple operations, such as cut, copy, and paste. Some more effect functions with little complexity (Simple Filtering, Delay) are also implemented. More sophisticated analysis functions (spectrograms, sonagrams, pitch determination) are underway or partially done.
LMMS
LMMS (formerly Linux MultiMedia Studio) is a free cross-platform alternative to commercial programs like FL Studio®, which allow you to produce music with your computer. This includes the creation of melodies and beats, the synthesis and mixing of sounds, and arranging of samples. You can have fun with your MIDI-keyboard and much more; all in a user-friendly and modern interface.
Lauloid
Lauloid was a singing synthesis program based on libsms. Now the repository includes documentation and scientific papers about the algorithms used in VOCALOID and UTAU. Reverse engineering results of the file formats and example score files will be published in this repo too.
Libav
Libav is a complete, cross-platform solution to decode, encode, record, convert and stream audio and video. This package contains the avplay multimedia player, the avserver streaming server, the avconv audio and video encoder, and the avprobe stream analyzer. They support most existing file formats (AVI, MPEG, OGG, Matroska, ASF...) and encoding formats (MPEG, DivX, MPEG4, AC3, DV...). Additionally, it contains the qt-faststart utility which rearranges Quicktime files to facilitate network streaming. This package also serves as a replacement for the former 'ffmpeg' package.
MMA - Musical Midi Accompaniment
MMA is a accompaniment generator -- it creates midi tracks for a soloist to perform with. User supplied files contain pattern selections, chords, and MMA directives.
MarkLaR
MarkLaR is a FOSS text editor for Markdown, which is a plain text markup format created by John Gruber and Aaron Swartz. For more information about Markdown, please visit John Gruber’s website. MarkLaR is a fork of ghostwriter and is furthermore inspired by MarkRight.
Mellite
Mellite is an environment for creating experimental computer-based music and sound art. It is a desktop application, allowing you to work with real-time and offline sound synthesis processes, combining multiple perspectives such as live improvisation, implementing sound installations, or working in DAW-like timeline views. Mellite runs on all major operating systems and can be used both in a purely graphical fashion, or by writing and connecting snippets in the Scala programming language.
MhWaveEdit
mhWaveEdit is a program for playing, editing, and recording sound files. It supports .wav files and a few other formats. It can edit both large and small files, and has support for 8/16/24/32-bit signed and unsigned sample formats.
Midica
A Music programming language - translates source code into MIDI. Includes a player. Supports MIDI-Karaoke. Includes a MIDI analyzer. Supports several import and export formats. Can also be used to develop in other music programming languages like ALDA or ABC.
MusE
MusE is a MIDI/Audio sequencer with recording and editing capabilities. MusE aims to be a complete multitrack virtual studio.
MuseScore
Full-featured WYSIWYG editor for sheet music. Large vocabulary of notations (jazz notation, percussion, early music, etc.). It will play your scores and can also import and export many formats, including e.g. import and export of MIDI and export to PDF, WAV, and LilyPond.
Music Library
'Music Library' is a music-on-demand system for phpGroupware. It searches recursively through a directory full of files for audio formats you specify and dumps their artist, album, and track names into a database. You can then browse, search, or listen over HTTP. It features custom playlists and comes with an MP3 renaming script to make administration easier.
Postslate
Postslate is a tool for video post-production. When video and audio have been recorded separately, with a slate used to generate claps, Postslate allows you to sync the audio and video prior to editing.
Psychosynth Heckert gnu.tiny.png
The Psychosynth project aims to create an interactive modular soft-synth inspired by the ideas of the Reactable. We will try to provide a clean object oriented API to allow the creation of new innovative interfaces for the synthetizer and a 3D simulator of a Reactable-alike device with support for collaborative music creation over the internet. Our main goal is to create a free software alternative to allow newbies, developers and professionals explore new ways of making music. It is also important to build a comunity to ease the comunication between we, software devolopers, and electronic music makers, who can provide insightfull ideas on how to turn new experimental features into usefull and creative tools.
QTau
QTau is a piano roll editor for GNU/Linux. It is designed for editing lyrics for singing synthesis and makes use of Masanori Morise's WORLD vocoder. It also support JACK-Transport as a ReWire replacement.
Schism Tracker
Schism Tracker is a tracked music editor that aims to match the look and feel of Impulse Tracker as closely as possible. The player code is based on the Modplug library, so it supports a wide variety of module formats.
Secret Rabbit Code
Secret Rabbit Code (aka libsamplerate) is a Sample Rate Converter for audio. One example of where such a thing would be useful is converting audio from the CD sample rate of 44.1kHz to the 48kHz sample rate used by DAT players. SRC is capable of arbitrary and time varying conversions; from downsampling by a factor of 256 to upsampling by the same factor. Arbitrary in this case means that the ratio of input and output sample rates can be an irrational number. The conversion ratio can also vary with time for speeding up and slowing down effects.
Sfxr
sfxr is a procedural sound generator.
Simple Multitrack
Simple Multitrack is a set of programs that allow the simultaneous recording of an audio track while listening to a monitor mix of other tracks. It is software for the command line.
SndBite
'SndBite' is an audio editor designed for breaking large recordings into smaller components with great efficiency. Its principal intended application is in linguistic research where it is often desirable to put each word or sentence into a separate file before further processing. Features include multiple simultaneous views of the waveform at different resolutions, the ability to position window edges at transitions between sound and silence, automated setting of cut points at zero-crossings, automatic filename generation easily controlled by the user, and optional automatic playback on window motion.
Surge
Surge, now called Surge XT, is one of the most popular digital synths used by the free software community. In Surge, each patch contains two scenes which are separate instances of the entire synthesis engine (except effects) that can be used to create layered or split patches. It features 3 oscillators per scene, with 12 versatile oscillator algorithms (Classic, Modern, Wavetable, Window, Sine, FM2, FM3, String, Twist, Alias, S&H Noise and Audio Input), 2 filter units in 8 different configurations and 12 LFO units (6 are per voice and 6 global for the whole scene). Surge was renamed to "Surge XT" after it was entirely rewritten in JUCE.
Swami
Swami (Sampled Waveforms And Musical Instruments) is an application for editing and managing MIDI instruments, such as SoundFont files. A programming API is also provided for integration with other applications.
Vital
Vital is a modular visual synthesizer with animated controls, filter responses, waveforms, smooth LFOs, oscilloscopes, spectrograms, and more. It is GPU optimized and all animations run at 60 FPS. It is a direct competitor to popular proprietary synth Serum. Vital does not accept any pull requests and has some GPL-compatible restrictions. A community fork of Vital is maintained under the name VItalium.
Wavbreaker
This application's purpose in life is to take a wave file and break it up into multiple wave files. It makes a clean break at the correct position to burn the files to an audio cd without any dead air between the tracks. It will only read wave files, so use an appropriate tool to convert ogg, mp3, etc. files and then break them up.
WaveSurfer
'WaveSurfer' is a sound visualization/manipulation tool for novice and advanced users, with a simple and intuitive user interface. It can be adapted to various tasks including speech research and education, speech/sound analysis, and sound annotation/transcription. You can also make more advanced/specialized applications by extending it with custom plugins or embedding its components in other applications. Its flexible interface handles many different file formats; it also supports encoding and Unicode with unlimited file size.
Wired
Wired is professional music production and creation software. It brings musicians a complete studio environment to compose, record, edit, and mix music without the need of expensive hardware. Wired supports unlimited playback and recording for audio/MIDI tracks, and introduces a plugin system for instruments and effects. It handles live instruments (through sound card analog or MIDI inputs), virtual instruments, and sound effects. It manages the most used plug-in types (VST, VSTi, LADSPA, etc.). It is composed of racks, a sequencer and a mixer.
Wx12Ton
'wx12Ton' lets users work with music involving twelve-note series. In particular, it displays the 48 forms of a twelve-note series, and tests series for tonal phrases. It also lets users to list the complete set of all twelve-note series which satisfy certain criteria.
Zrythm
Zrythm is a digital audio workstation designed to be featureful and easy to use. It allows limitless automation, supports LV2 plugins, works with the JACK audio backend, provides chord assistance and can be used in English, French, Portuguese, Japanese and German. It is written in C using the GTK+3 toolkit, can be extended with GNU Guile, and runs on GNU/Linux, FreeBSD, MacOS and Windows.


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