Dark L (Velarization) Detector
In GenAm and RP, the /l/ sound in "feel" (coda) is pronounced differently than in "leaf" (onset). The back of the tongue raises toward the velum, drastically lowering the F2 frequency.
Awaiting input...
Clinical Notes
Relying on auditory feedback alone for this metric is proven to be ineffective in adult language learners. Biometric feedback is required to remap established motor patterns.