For those who are curious, here's an excellent example of what is involved in doing this.

http://elm-chan.org/works/sc/report.html

This circuit could be modified to work on a 24 kHz monitor if one was inclined to do so, but it's quite a lot of work. Mr. Chan's creations are very impressive, all hand assembled on perfboard, but it would have been FAR easier to duplicate if he had used a PCB layout instead.