DefleMask Tracker

DefleMask Tracker is a donationware multi-system chiptune tracker created by Leonardo "Delek" Demartino. It is currently on version 0.12.0 and emulates 7 sound chips, including both SID versions and the 2A03.

Delek introduced his tracker to the First FamiTracker Forums on April 11, 2011 in a post entitled "Deflemask - A Multi-System Tracker". The community was initially excited by the program, but over time, people became concerned with several of its issues, including an export function that would often create unplayable files. Delek became increasingly averse to bug reports and suggestions, especially ones about the GUI, eventually stating that he would ignore interface suggestions entirely, saying that posts with them had "bad attitudes". The thread was locked with the rest of the original FamiTracker Forums on May 13, 2015, with the last post announcing the release of version 0.10.0 of the program.

Libraries used
It has been claimed that DefleMask's emulation of sound chips uses libraries developed by third parties. If one of these libraries is normally distributed under the GNU General Public License (GPL), this would oblige Delek to publish the complete corresponding source code of DefleMask unless the library's author has sold a dual license to Delek.
 * TO DO: Identify GPL libraries and provide evidence

As a Meme
DefleMask became a meme on the FamiTracker Discord Server and Forums sometime after its thread closed. Jokes about it usually involved puns on its name (with 'DefectMask' being one of the more common ones) and mocking its GUI. A more recent form of the meme is 'JoyMask', a version of the DefleMask logo altered to be in the shape of the 'Joy' emoji.