The song of Nicaraguan Seed-Finch is described as "a long (ca. 4-10 s) caroling series of notes, delivered at a rate of about 4 per second. The notes are mostly slurred whistles, either pure tones or with harmonics ... many notes are doubled, some are tripled, and some occur in repeatable sequences" (Stiles 1984). This song is similar to that of Thick-billed Seed-Finch (Sporophila funerea), but has a slower tempo and a deeper, richer tone (Stiles 1984).
For a representative audio recording with sonogram, see audio
A call of Nicaraguan Seed-Finch is a short, sharp chip or chek (Stiles 1984).