South Wales Welsh - am/am biti

Is am biti interchangable with am and all its forms (amdana i, amdanat ti, etc.)?
Is am biti only used in the south?
Is it used in places like Aberyswyth as well?

You’ll hear ambiti predominantly in the south, and you can certainly use it across the board, but the way I hear it, it is usually not conjugated the way am is.
For example: Ti 'di clywed ambiti hyn? Have you heard about that?
Paid becso ambiti fi Don’t worry about me

By the way, you can ask small questions like this without opening a new topic every time:

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Ah thank you for the clarification and the advice (you can probably tell I’m new to this forum thingy :sweat_smile:)