How to insert several init expressions in ftm.mess's inspector?

A: Put everything between double quotes and insert a comma between each expr, and leave out the '$' for super-local variables:

 "(new fmat) 2 3, random_freq1A = 0 , random_freq1B = 0" 

Note that the first list (here "(new fmat) 2 3") is the initialisation for the inlet variables $1, $2, etc.

Example: ftm.mess help patch, p names & variables.