What really surprises me is that there seems to be no standard to geocode an audio file. A photo can contain coordinates in the EXIF tag but for audio there is no such thing as a far as I know. I have been looking for a voice recorder that could do that. I think it would be really useful for personal notes. But have come up empty.
Apple's Voice Memos uses your current location as the default name for the voice note. As far as I know it's not geotagged in the same sense that a photo is, but for personal notes it seems good enough.
For me, a single lat/long would be sufficient because I would only make a short voice memo in each file. But I can certainly understand that it would not be sufficient for cases with long files when you move during the recording.