1958 – Stereo Disk
1962 – Time Code Format
1963 – Compact Cassette
1965 – Noise Reduction
1972 – Digital Tape
1978 – CD – Compact Disc
1980 – Multitrack Recorders
1982 – Recording Equipment
1986 – Digital Consoles
1994 – Promix 01
1999 – Audio DVD
Note – A post “Digitalized – A Visual Representation Of The Evolution Of Audio Formats” notes that the CD was invented in 1982. I’m checking into more details on the invention of the CD. The fact that it was invented so long ago and did not become affordable enough to become main stream is extremely interesting.