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Advanced Gtk+ Sequencer

The gsequencer binary provides you a user interface. It allows you to play, capture and create music. There is a piano roll, automation and wave form editor. It has machines for playing drum samples, Soundfont2 sound containers and synthesizers. They usually can be connected to a MIDI input source (instrument). All sources need to be connected to the sink provided by AgsPanel, thus the properties dialog from machine's context menu is responsible. The engine is extensible by following plugin formats: LADSPA, DSSI, LV2 and VST3. It has support for various audio backends like ALSA, Pulseaudio, JACK, OSSv4 and CoreAudio.

Copyright (C) 2005-2022 Joël Krähemann

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

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It is recommended to have a realtime kernel in conjunction with ags in order to do more computing expensive synthesis.

Please visit for more information.

Following site gives you advice in configuring ALSA

You might want to disable systemd accounting.

$ systemd-run -p CPUAccounting=false -p MemoryAccounting=false -p TasksAccounting=false -p IOAccounting=false -p BlockIOAccounting=false --scope gsequencer

If you have pulseaudio running you might run gsequencer with pasuspender like:

$ pasuspender -- gsequencer


The Advanced Gtk+ Sequencer framework is related to audio computation by representing it within a tree structure. It does various abstraction and the base library can serve as fundament of any application.

libags provides an application context and a threaded tree. Which is synchronized by hard-realtime fashion. In terms of deterministic dead-line. Each tic of the used threads has to fulfill its work in order to proceed. The file object might be used for light-weight composition or persistency.

libags-audio is built upon libags and provides a tree of audio signals. They can be computed in parallel. One key feature is the nested recycling tree. It allows to share audio data across channels. Further it avoids to wedge the parallel tree. There is support for free plugin standards like LADPSA, DSSI and Lv2. So it does give support to read or write MIDI data.

libags-gui is a standalone library providing additional Gtk+-2.0 widgets.

GSequencer is the main application providing a Gtk+-2.0 GUI. Allowing you to edit or record notation. It is designed to be accessible you should be able to control the entire application by keyboard. Likewise it implements various Atk interfaces. The frontend to AGS requires to add machines by menubar and link them appropriately with properties dialog. It is available of the context menu. Note you can't create any loops within the tree.

Build using mingw

To build on windows you need gnulib. First import some functions using gnulib then compile with msys2.

$ git clone git:// $ ./gnulib/gnulib-tool --import langinfo regex signal-h sigaction strings sys_types memcpy $ CPATH=/mingw64/include PKG_CONFIG_PATH=/mingw64/lib/pkgconfig:/mingw64/lib64/pkgconfig CC=x86_64-w64-mingw32-gcc.exe ./configure --host=x86_64-w64-mingw32 --prefix=/mingw64 --disable-rt --enable-w32api --disable-alsa --enable-alsa-compat --disable-pulse --disable-jack --enable-wasapi --disable-x11 --without-webkit --with-poppler $ make -j8 $ make install

Build with VST3 support

To build gsequencer with VST3 support you need download and compile the VST3 SDK. Then you can set some env variables configure is aware of.

export LIBAGS_VST3_RELEASE_TYPE="-DRELEASE" export LIBAGS_VST3_CPPFLAGS="-I$HOME/github/vst3sdk" export LIBAGS_VST3_LIBS="-L$HOME/github/vst3sdk/build/lib"

$ ./configure --prefix=/usr --enable-vst3 $ make -j8 $ sudo make install

General Notes on Licensing

The Advanced Gtk+ Sequencer code base uses copyright year ranges for its source files. There was much effort on implementing the API since 2005 as of today in year 2019. The source code was developed by Joël Krähemann and is the copyright holder.

Notes on copyrighted files listed:

  • AUTHORS (Copyright (C) 2005-2018 Joël Krähemann, permissive)
  • COPYING (this is the GNU GPLv3+ license)
  • (this is the GNU FDL-1.3 license)
  • COPYING.server (this is the GNU AGPL-3+ license)
  • COPYING.stk-4.3 (this is the STK-3.3 license)
  • ags_license_header (this is the GPLv3+ license header for *.c and *.h files)

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