Hello thincat,
I can only speak for myself but I'd use because2. Your pronunciation, however, is not natural. I have recorded the following sentence which I found in the Longman Dictionary of Contemporary English:
Just because you’re my brother doesn’t mean I have to like you!
Listen to the recording (England - English) attached to this message.
I checked the pronunciation in the aforementioned dictionary and they use the first one, the one you used in because1.mp3. I think that their pronunciation of 'because' is more common than mine.

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