Many seem to be confused about KCS versus Omega, KCS versus Level II 
etc. So here is some history of KCS, as I remember it (Dr. T might 
correct me):

First there was KCS for Commodore 64. This (I think) only had open 
mode. The program was then ported to the Atari, and track mode and 
song mode was introduced in addition to open mode. The song mode was a 
simplified version of open mode (segment A followed by segment B 
followed by segment C, etc.) The first versions had no gem menus, and 
was command driven. I jumped on at version 1.5. Then came version 1.6 
and 1.7, where the MPE and Gem menus was introduced. At the same time 
a version called Level II was introduced. This had the PVG 
(Programmable Variations Generator) and the Master Editor. KCS and 
Level II was sold as separate programmes. After version 1.7 the 
version numbers jumped to 3.0. The MPE concept was developed more, and 
among the important modules came Tiger (The Interactive Graphic 
EditoR), first as a separate program, and Quickscore. 

When version 4.0 came, the program came as a package and was renamed 
Omega (or KCS Omega). This package included Tiger , Graphic Song 
Editor and Quickscore, along with some smaller modules (AnyMPE.prg 
etc.) The Song Mode was skipped when the Graphic Song Editor was 
introduced. The Omega package had both KCS versions. 

The last official release was Omega II, which also introduced the 
Mixer MPE program, new Open Mode event types, plus Tiger 2.0. Tiger 
2.0 has many new functions. Some maybe came from PVG, but function in 
realtime, and some functions seem to be inspired by (former 
Intelligent Musics) Realtime's "fill" feature. The very last version 
is 5.11. This version is still sold by Emile Tobenfeld. The main new 
features here are still more Open Mode event types for interactive 
playback. It also includes an unfinished, but workable version of Song 
Editor. It looks ugly, but has some features for interactive playback 
that can be useful (MIDI controllers can control time and velocity 
transposition or time shifts of individual lines.) Also a new MPE 
module that can import individual tracks or sequences from other 
files. Very useful.

Trond Einar Garmo