Are we required to use the Hebrew pronunciation of our minhag in tefilah and for brachot? What is the source for this?
I'm of Yekke Ashkenazi background but as a baal teshuva learnt Hebrew with a modern Israeli pronunciation. I recently studied an online Aish course on brachot which said that we must use the pronunciation of our minhag.
I've been trying to relearn brachot and tefilah with an Ashkenazi pronunciation but of course this is easier said than done, particularly with words and brachot I've been saying for years now, and at the moment I'm saying some brachot with one pronunciation and some with the other. Is this worse?