Observed song in captivity; a fast, “clean”, continuous trill (much faster than Allard’s) with no harsh/creaky quality (as with Carolina ground cricket). Sang readily when placed in a cage with a female ground cricket sp. Song was given several times, however, one of the most noticeable characteristics was the volume: very soft/quiet. Maybe just this individual?

Also note exceptionally small size (~8mm); compare Striped Ground Cricket from same site = 50% larger (~12mm):

https://www.inaturalist.org/observations/62313869