Just for listening, not actually retiming the audio. I am looking for specific sounds in a track. They are not clearly visible in the spectrogram view, and 'find similar' doesn't find them—but they are easily discernible to the ear, even at 2X or 4X. Is other-than-realtime playback possible? How?

Hi - Well, you can drag/scrub the playback cursor by hand [forwards & backwards] for slower playback [though it feels a bit glitchy on my system]. And of course you could use the Preview feature to play at a slower or faster playback speed in the Variable Time or Time & Pitch modules without actually processing the audio, pausing to note the locations of audible sounds as you go and then going back to those spots and processing them as needed. But other than that I couldn't find any options or shortcuts/modifier keys for playback speed other than realtime.