cross-platform SoundFont editor

 Polyphone is an open-source soundfont editor, available for platforms
 supported by Qt5 (GNU/Linux, MacOS X, Windows). It can be used to
 create musical instruments by putting together a multitude of audio
 samples and configure them appropriately, which can then be used by
 synthesisers such as FluidSynth (also in MuseScore) and Timidity and
 played using a MIDI keyboard or other instrument. Polyphone provides
 a simple, efficient and portable interface for creating and editing
 soundfonts in various formats, and tools to facilitate and automate
 the setting of different parameters, making it possible to handle a
 large amount of data. It is available in several languages.
 .
 Features include:
  - import from SF2, SF3, SFZ and sfArk file formats
  - export to SF2, SF3, SFZ file formats
  - support of SF2 format v2.01 and v2.04 (with 24-bit samples)
  - compatible with JACK and ASIO audio servers
  - built-in synthesiser, controlled by a virtual keyboard or MIDI signals
  - automatic recognition of root keys, sample pitch and correction
  - automatic loop of samples
  - simultaneous editing of parameters
  - specific tools for musical instrument creation
  - sound recorder to keep track of what is played in a WAV file
  - soundfont browser connected to the online repository