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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.


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