Different browsers have different problems with this applet. The biggest problem, though, is that Java 1.1 has very poor sound support. All you can do with it is “beep” or play a sound clip. You can’t synthesize sounds on the fly or anything. Here is a summary of how the applet fares in various browser environments.
When playing chords, they seem to cut out occasionally
Gets keyboard focus only after clicking with mouse.
Java version is too old.
Gets keyboard focus only after clicking with mouse, won’t play anything.
Can’t get keyboard focus.
Gets keyboard focus only after clicking in browser menu (!)