Based on this list of Glulx interpreters on ifwiki, there are three or four stable Glulx interpreters that support Glulx sound: Windows Git, Windows Glulxe, and Spatterlight. (The notes for Gargoyle say “Different for each game format,” but I know I’ve used sound on Gargoyle before, though I haven’t tried it lately.)
For my purposes, the interpreter also needs to support either timekeeping or sound notifications or both (and if it only supports one of the two, preferably timekeeping).
Does this list sound right, or are there any other interpreters that you would recommend (or not recommend) for Glulx sound in 2024?
I published a Glulx game with music (Beat Witch) last year, and I found that Gargoyle has support for sound, and I did most of my testing on that. Fabularium also has sound support.
Lectrote does not have Glulx sound support, though I hope it comes soon. (From the GitHub page: “Because this relies on the Quixe interpreter, sound is not supported.”)
Glulx games (which normally use Quixe), thus don’t have sound support if played online … unless the author does some fancy coding magic or uses a different interpreter, such as Vorple or Bisquixe.
I can’t comment on timekeeping support, other than the fact that I’d expect a good number of interpreters would, and any interpreter that allows you to work with JavaScript (like Vorple) would most likely have a way to work with that. You may want to create a small game to test different interpreters on.