Impulse Tracker 2.14 screenshot
2.14 Patch #5 / April 8, 1999
|Written in||Assembly language|
Impulse Tracker is a multi-track digital sound tracker (music sequencer). Originally released in 1995 by Jeffrey Lim as Freeware with commercial extensions, it was one of the last tracker programs for the DOS platform.
Impulse Tracker was authored by Jeffrey "Pulse" Lim for the DOS/x86-PC platform.Impulse Tracker was coded in Assembly language, and the interface was heavily influenced by that of Scream Tracker 3.
The first version was released in 1995 and included example music, provided by Jeffrey Lim and Chris Jarvis. The software was distributed as freeware, though extra features, such as support for WAV output and co-editing songs over IPX networks, were provided for a fee. After the stereo WAV writer plugin was publicly pirated, the original author announced that he would discontinue development after version 2.14. The latest version was v2.14 Patch #5 released on April 8, 1999.
On February 16, 2014, Jeffrey Lim announced that he would release the complete source code of Impulse Tracker as part of its 20-year anniversary. On October 19, 2014, the first part of the source code was released on a Bitbucket repository. On December 25, 2014, the missing parts (sound drivers) were added and the code was officially released under the BSD license.
New Note Actions (NNAs) is a feature that handles commands received on the same channel as another instrument which is still playing. NNAs allow the user to customize the subsequent action:
The .IT file format is the format native to Impulse Tracker. It is similar to older formats such as .MOD, but features new additions such as new note actions which allow the user to customize subsequent actions on receiving commands from the same channel as the one playing.
Other music-playing software that supports the IT file format include Cowon jetAudio, Media Player Classic, MikMod, ModPlug Tracker, OpenMPT, Renoise, Schism Tracker,SVArTracker,XMPlay, TiMidity, VLC, Winamp, and, XMMS 
Erez Eizen of Infected Mushroom and Shiva Shidapu composed his first trance music on Impulse Tracker. Ian Stocker used IT with other software in his collaboration for the music in the Nintendo DS version of The Sims 2.
The video games Pocket Tanks and Grid Wars use the IT format for some of their songs. Various games by Epic Games such as the first Unreal and Unreal Tournament as well as Deus Ex used the IT format in a "UMX" container format.
Trance producer Sean Tyas began his music production career using Impulse Tracker.Electronic rock musician Blue Stahli has revealed to have used Impulse Tracker and other trackers in the past.
I was in my Mom's basement tooling away on Impulse Tracker on a 386 just doing Nintendo music until some Loop Library company hired me as a producer.