I was talking today with an English co-worker about whether he says "an H-1B visa" or "a H-1B visa", which hinges on whether one says "aitch" or "haitch" for the letter H.

And I noticed that unlike other languages such as German or French or Romanian that change the indefinite article based on things like gender or case, in English we change the indefinite article based on the sound of the following word.

Are there other languages that change the indefinite or definite article based on what the following word sounds like?