Music stuff Crossword

Multi-track recording allowed for sound instead of mono sound
Victrola doors controled _________
Stereo sound allowed different sounds to come out of the left and the right_______
The _______ disk was introduced in 1982, but not widely used until the late 1980s
_________ introduced the Digital audio tape in the year 1987
Recording device made by Thomas Edison
Multi-track ______ became widely used for music in the 1950s
_______ invested $50,000 in magnetic tape recording technology
The _______ from the phonograph was difficult to copy
Recording device made by Emile Berliner