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The way the radio stations used to do it was the DJ had two or three turntables in on air studio and while one song was playing he or she positioned the other record on the other turntable so it would be ready to play at a certain track instantly. Like the movie American Graffiti where you see Wolfman Jack in the studio doing just this. With records you have to sit with it and be constantly doing this.
You can’t, as I can see, have your station playing with everything at random while unattended, including the voice tracks. One drawback.
If you want to stay anologue you could use a reel to reel tape recorder…..you can put a lot on 3600 ft of tape.