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Impulse Tracker

Impulse Tracker is a multi-track digital sound sequencer proliferated on the MS-DOS platform. It was authored by Jeffrey Lim and discontinued after version 2.15. It was available as freeware, though the author supplied extra features (like saving stereo WAV files, possibility to use an IPX network mode) in exchange for some cash. It reigned among the popular trackers of its time including ScreamTracker 3 and FastTracker.

Like most MOD editors music is arranged into a grid of channels, each channel containing key-on and optional key-off instructions not unlike MIDI.

One of the features which set this MOD editor apart was NNAs, New Note Actions. If a new key-on command is received in the same channel as another instrument which is still being played, NNAs allow the user to customize the action that next occurs:

Cheesetracker is a GPLd Impulse Tracker clone, which runs under Linux and Mac OS X.