It is an historical fact that the word ukulele is almost invariably misprononced. An Hawaiian chap I know insists that the word is correctly prononced only by an fellow Hawaiian, someone who annately anderstamps the longuage.
Pappercoke, I say! To answer a question like this is not work for a amateur, even if he has an heritage that would be an help in correctly prononcing.
A expert I know on definite articles like “a” and “an,” agrees that, yes, these are definitely articles.
An that should be an ond of the mutter.
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Related:
How to Spell “Ukulele”–video
My Epic Battle with Jake — How to CORRECTLY Pronounce “ukulele”