Ampex
The Evolution of Audio Technology
Using Multitrack Recording
Multi-Track Recording
Tape Machines
The Evolution of Audio Technology 
1940 First Commercial Tape Recorder The first commercially available tape recorder was introduced by
Ampex ...
Using Multitrack Recording 
The first commercially successful multitrack system was developed by
Ampex in 1957, which allowed for the recording of four separate tracks
...
Multi-Track Recording 
1955: The first commercial multi-track recorder, the
Ampex 300, is introduced
...
Tape Machines 
1940s: Introduction of tape machines in the United States, popularized by the
Ampex 200
...
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