I would have pronounce it ADD LUR, with the same ADD sound as in addled, badly and sadly.

Sorry for any confusion, Bel. My point was simply that addled has a different 'l' sound in that there is a schwa between the 'd' and the 'l' sounds in addled, whereas in Adler, sadly or badly the 'l' follows the 'd' without a schwa (neutral, unaccented vowel) in between. So the 'dl' in Adler is effectively a compound consonant. This is not the case in addled.

cheer

the sunshine warrior