Comment by EvanAnderson

"Inside the Apple //e" included a program listing to digitize sound using the cassette interface[1]. Years before I got an audio digitizer for a PC I had great fun recording a few seconds at a time of audio on the machines in my public library. I made some floppies that booted and played audio samples. They were super slow to load and the sound quality wasn't great, but voices and songs were recognizable.

[1] https://archive.org/details/InsideTheAppleIIe/page/n341/mode...