What is the schwa vowel sound in banana?

The schwa sound in "banana" is in the second syllable, represented by the "a" in "na".

Here's a breakdown:

* ba - The "a" here is a short "a" sound, similar to the "a" in "cat".

* na - The "a" here is the schwa sound, a short, unstressed vowel sound. It's similar to the "uh" sound in "about".

* na - The second "a" is also a schwa sound.

So, the word "banana" is pronounced with a schwa sound in the second and third syllables.