Pedal Jacks 3 of them. Use 1 Exp pedal, this mean I have 4 buttons to add with Jacks??

FM3 has 2 Pedal Jacks. If you are plugging in an expression pedal then you have 1 remaining jack left. That jack can accept 1 or 2 external switches, or 1 expression pedal.
 
FM9 has 3 jacks. It can take 1 exp pedal and 2 switches. It doesn't support TWO switches on a single Pedal port like the FM3 via TRS connection.
 
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