QSampler A LinuxSampler Qt GUI Interface

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What's QSampler ?

QSampler is a LinuxSampler GUI front-end application written in C++ around the Qt4 toolkit using Qt Designer. At the moment it just wraps as a client reference interface for the LinuxSampler Control Protocol (LSCP).

LinuxSampler is a work in progress. The goal is to produce a free, open source pure software audio sampler with professional grade features, comparable to both hardware and commercial Windows/Mac software samplers. The initial platform will be Linux because it is one of the most promising open source multimedia operating systems. Thanks to various kernel patches and the Jack Audio Connection Kit, Linux is currently able to deliver rock solid sub-5 millisecond MIDI-to-Audio response.

Licence: GNU General Public License (GPL)

Sourceforge project page: http://sourceforge.net/projects/qsampler
See also: http://www.linuxsampler.org

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Click on image to see more screenshots...


The software requirements for build and runtime are listed as follows:


Optional (opted-in at build time):


Latest release

2013-12-31 - A fifth of a Jubilee.

  • More preparations for Qt5 configure build.
  • Standard scalable format (SVG) and MIME type icons support for session files (*.lscp) is now being added.
  • Preparations for Qt5 migration.
  • Added include to shut up gcc 4.7 build failures.
  • Make(ing) -jN parallel builds now available for the masses.
  • Fixed Makefile.in handling of installation directories to the configure script eg. --datadir, --localedir.
  • Made lookup of translation files work inside a Mac OS X bundle.
  • Minor Mac OS X compilation error fix.
  • Debugging stacktrace now applies to all working threads.
  • Made lookup of translation files more robust on Windows.
  • Fixes for cross compiling and building for Windows with configure and make.
  • libX11 is now being added explicitly to the build link phase, as seen necessary on some bleeding-edge distros eg. Fedora 13, Debian 6.
  • Moving from old deprecated Qt3'ish custom event post handling into regular asynchronous signal/slot strategy.
  • Sampler channel and instrument file requester support for other than GIG engine instrument files (*gig; *.dls) has been added, making roads for the newer SFZ and SF2 engines instrument files (*.sfz; *.sf2).
  • General standard dialog buttons layout is now in place.
  • Initial widget geometry and visibility persistence logic has been slightly revised as much to avoid crash failures due to wrong main widget hidden state.
  • General source tree layout and build configuration change.
  • Automatic crash-dump reports, debugger stack-traces (gdb), back- traces, whatever, are being introduced as a brand new configure option (--enable-stacktrace) and default enabled on debug build targets (--enable-debug).
  • Attempt to fix broken instrument list model/view on Qt >= 4.6.
  • Device parameter spin-box default maximum has been set higher: now at a magic 24-bit limit (16777216) instead of older 16-bit (65536), possibly fixing bug #136.
  • LADISH Level 1 support has been added: SIGUSR1 signal trap just makes it a shortcut to File/Save.
  • MIDI Device Status menu is disabled when no MIDI device exists; a menu separator has been added.
  • Window manager's close button was found missing from the Devices and Instruments widgets when on Qt >= 4.5, now fixed.
  • MIDI activity indicator on channel strips and MIDI device status widgets is now implemented as a flashing green LED, instead of a lame green solid background :).
  • Global configuration state is now explicitly saved/committed to disk when View/Options... dialog changes are accepted and applied.
  • Czech (cs) translation added (by Pavel Fric).
  • Previous and older pre-releases, including the change log, are also available here. You may also check out from the latest bleeding edge development source tree, using Git.

    You can browse all files available for download, including binary packages, at Qsampler Files on SourceForge.net.


    You'll need to install the liblscp package before you can play with qsampler. This is for LinuxSampler Control Protocol support library, which qsampler is based.

    Grab the source from here: liblscp-0.5.7.tar.gz

    The installation procedure is similar for both packages, liblscp and qsampler, and follows the standard for source distributions. For each one, in the extracted source directories, just do:

    ./configure [--prefix=prefix]

    and optionally as root:

    make install

    Note that liblscp is a shared library, so be sure to have it registered on your shared library path (either on LD_LIBRARY_PATH environment variable or on /etc/ld.so.conf). Maybe it's already up there.

    The procedure for qsampler will install the following files:

    Just launch prefix/bin/qsampler and you're off (hopefully). Note that the default installation path prefix is /usr/local .


    Qsampler holds its settings and configuration state per user, in a file located as $HOME/.config/linuxsampler.org/Qsampler.conf. Normally, there's no need to edit this file, as it is recreated and rewritten everytime qsampler is run.


    Plenty as this is still beta software. Bug reports should be posted on LinuxSampler bug tracker.


    Qsampler is open source free software. For bug reports, feature requests, discussion forums, mailling lists, or any other matter related to the development of this piece of software, please use the LinuxSampler project site.

    You can also find timely and closer contact information on my personal web site.

    Hope you enjoy,

    rncbc aka Rui Nuno Capela
    rncbc at rncbc dot org

    Christian Schoenebeck
    schoenebeck at software dash engineering dot org

    Get Qsampler at SourceForge.net. Fast, secure and Free Open Source software downloads

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