https://en.wikipedia.org/wiki/Open_Music_Systemhttp://oldschooldaw.com/opcodetracking versions/dates for 3 different products
column 1: vision
column 2 : studio vision pro
column 3: oms
1986 MIDIMAC sequencer (vision prototype)
1987 Opcode MIDIMac Sequencer 2.5
1989 v1.0 Vision (MAC)
1989 Audio Vision ("Studio Vision" prototype)
1990 EZ Vision
1990 ------------------------------v1.0 Studio Vision
1990 ----------------------------------------------------------------------v1.0 OMS
1990 v1.2u2 Vision (MAC)
1992 v1.32A Vision (MAC)
1992 v1.4 Vision (MAC)
1992 ----------------------------------------------------------------------v1.1.3 OMS
1993 ----------------------------------------------------------------------v1.2.1 OMS (may 1993)
1994 ------------------------------v2.0.3 Studio Vision ("pro"?)
1993 ----------------------------------------------------------------------v1.2.3 OMS (dec 1994)
1995
v2.0.8 Vision (MAC)1995 v2.0 Vision 2.5 (for windows)
1995 ------------------------------v3.0 Studio Vision Pro (Sept 29, 1995)
1995 ----------------------------------------------------------------------v2.0 OMS (introduced /w Studio Vision 3.0??)
1995 ------------------------------v3.0 Studio Vision Pro 3.02 (Dec 1995)
1996 ------------------------------v3.0 Studio Vision Pro 3.06 (Aug 1996)
1996 ----------------------------------------------------------------------v2.1 OMS
1996 ----------------------------------------------------------------------v2.2 OMS (jul 1996)
1997 ----------------------------------------------------------------------v2.3.1 OMS (may 1997)
1997 ----------------------------------------------------------------------v2.3.2 OMS
1997 ------------------------------v3.5 Studio Vision Pro (first quarter - for mac)
1997 ------------------------------v3.5.4 Studio Vision Pro
1998 ------------------------------v3.5.6 SVP (Feb 1998)
1998 ----------------------------------------------------------------------v2.3.3 OMS (Feb 1998)
1998 ----------------------------------------------------------------------v2.3.4 OMS (May 1998)
1998 ------------------------------v4.0 Studio Vision Pro (Mar 16 1998)
1999 ----------------------------------------------------------------------v2.3.6 OMS (Jan 1999)
1999 ----------------------------------------------------------------------v2.3.7 OMS (Jun 1999)
1999 ------------------------------v4.5.1 (Sept 24th 1999)
1999 ------------------------------v4.5.3 Studio Vision Pro (11-11-1999)
1999 ----------------------------------------------------------------------v2.3.8 OMS ?
some file dates from the original cd installers of SVP:
svp 4.0 mar 16 1998
vision DSP Aug 26 1998
svp 4.5.1 Sept 24 1999
opcode software versions as of december 1994
http://www.oldschooldaw.com/forums/index.php?topic=559.msg582#msg582