API: How do I check if a sprite is playing?

I’m trying to make a program that, among other things, syncs audio with the playback (similar to to AAE). The best I’ve been able to do was have it invert the pause/play when you run the PlayAnimation command. This gets out of sync really easily, as there are a lot of other things that cause it to pause (such as editing or closing the image).

Realizing I should probably include a snippet of my code.

ase.app.events:on('beforecommand', function(ev)
    if ev.name == "PlayAnimation" then
        playing[lastSprite] = not playing[lastSprite]
        updatePlayingState()
    end
    if ev.name == "CloseFile" then
        playing[lastSprite] = nil
        command('setaudio', '')
        updatePlayingState()
    end
end)

updatePlayingState syncs with the host on whether to play the audio based on the playing table (using command("setplaying", true/false)), and ase is a reference to _G to make EmmyLua happy.