What this means for learners
MUINANE and Sundanese share 17 sounds — roughly 61% of Sundanese's inventory overlaps with MUINANE. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 9 sounds found only in Sundanese represent the greatest pronunciation challenge for MUINANE speakers. The adult brain tends to map unfamiliar sounds onto the closest native equivalent — a process that produces the characteristic "accent" of a second-language speaker. Learning to hear and produce these sounds as distinct requires focused ear training, not just repetition.
Conversely, MUINANE has 11 sounds not used in Sundanese. Native Sundanese speakers learning MUINANE will face the mirror-image challenge with these sounds.
Phoneme inventories from PHOIBLE. Data reflects one documented inventory per language; some variation exists across dialects and sources.