Sonarfrequencies?
 

How does that parameter work exactly? I know, single value, single frequency. But the actual doc says:

SonarFrequencies=M (VL, L, M, H)
Frequencies it operates at.

And in the realism mod sensors file it has things like:
SonarModel=usn_bqr_25
SonarType=TOWED
SonarFrequencies=VL,L

The vanilla sensors file on the other hand only uses one value/sensor (and no sensor has VL)..

So...? Can you actually give multiple values there? Parentheses at least gives an error if you use it.

TA is not supposed to be VL?

VL - very low
L - Low
M- Medium
HF - High Frequency