Oh, yeah, word specification is the easiest part of the problem -- that really is just follow-the-bouncing-ball stuff, and even modern karaoke only varies that by adding different word colors or similar simple stuff. You could do that from 1925 onward.
Making the lyrics plain for the singer while the background is projected on screen is the tough part, but I think it should be solvable. I'm just not mechanically inclined enough to say precisely how.
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Oh, yeah, word specification is the easiest part of the problem -- that really is just follow-the-bouncing-ball stuff, and even modern karaoke only varies that by adding different word colors or similar simple stuff. You could do that from 1925 onward.
Making the lyrics plain for the singer while the background is projected on screen is the tough part, but I think it should be solvable. I'm just not mechanically inclined enough to say precisely how.