Here is the block I use to tweak my VIIc in SH3 Commander 2.5
c:\program files\sh3 commander\cfg\randomized events.cfg
;--------------------------------------------------------------------
[0_data\Submarine\NSS_Uboat7c\NSS_Uboat7c.cfg]
FileType=T
ChooseFrom=1
RndMidPat=1
0_Unit|MaxSpeed=17;knots
0_Unit|MaxSpeedSubmerged=8;knots
0_Properties|PeriscopeDepth=13;meters
0_Properties|SnorkelDepth=11;meters
0_Properties|SurfaceDepth=8;meters
0_Properties|CrashDepth=30;meters
0_Salvo|1=1,2
0_Salvo|2=1,2,3
0_Salvo|3=1,2,3,4
0_Salvo|4=2,3
0_Salvo|5=2,3,4
0_Salvo|6=3,4
0_Salvo|7=1,4
;--------------------------------------------------------------------
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