Spectograms
1. Nasal formant: BAD vs. BAN
2. Aspiration and voice: BIT vs. SPIT vs. PIT
3. Vowel formant: [i] -- [e] -- [a] -- [o] -- [u]
4. Transitions and encoding: [pa] -- [ta] -- [ka]
5. Glides: YA vs. AY
6. Transitions, encoding, and glides: TEE vs. TOO
7. Creaky Voice: [ba]