Tuneic
Tuneic[1] is the secret audio language in Tunic. It is a musical cipher hidden throughout the game but never acknowledged. It is present in sound effects and the soundtrack itself. One phoneme in Tuneic is one pentatonic arpeggio. In this way, entities secretly "speak," and certain music tracks have "lyrics."
Discovery
Knowledge of Trunic and The Golden Path are the prerequisites for solving the Glyph Tower puzzle, and the Glyph Tower puzzle is what provides a.mp3 and its spectrogram, the Rosetta Stone for Tuneic. Furthermore, the Rosetta Stone itself links specific Trunic glyphs with specific arpeggios, so Trunic and basic music knowledge are required to decipher Tuneic.
SFX and Soundtrack Secrets
Google Document: Tuneic (Sound Puzzle Mappings)
Spectrogram Secrets
Certain pieces of music when viewed as a spectrogram reveal hidden images. These can contain Trunic glyphs.
a.mp3 from doyoufeartheeyesofthefarshore.co
Trunic translation: "We are the(e) eyes of the far shore"
Dark Passage behind the Old House
Image: The doodle of fox from page 52 of the instruction manual.
Maze Soldier Room
Shop - Bought Item
Trunic translation: "Buy"
Shop - When Page 22+23 of the Instruction Booklet is Offered
Trunic translation: "Free"
Shop - Prompt "Ok"
Trunic translation: "Kay"
Shop - Prompt "No"
Trunic translation:"No"