In-call recording... any way to change format ?

[Amamba]

I tried in-call recording cab and it works like a charm. I don't need it for the "spying coolness" factor (which is probably illegal in most states anyway) but this seems to be the best way to take notes (a phone # or address or a doctor's appt) while in a car.

My only complaint is that it saves in WAV files in main storage so the file size is huge.

Is there any way to direct it to the external storage, or change the format to a compressed one, or both ?