Open your basic.cfg and change the torpedo for your U-boat type and date to 9 for as many acoustics as you'd like:
Year0=1939
ForeTube00=3 ;TIII
ForeTube01=3
ForeTube02=3
ForeTube03=9 ;TXI
ForeTube04=9
ForeTube05=9
ForeResIntern00=9
ForeResIntern01=9
ForeResIntern02=9
ForeResIntern03=9
ForeResIntern04=9
ForeResIntern05=9
ForeResIntern06=3
ForeResIntern07=9
ForeResIntern08=3
ForeResIntern09=9
ForeResIntern010=3
ForeResIntern011=9
ForeResIntern012=3
ForeResIntern013=9
ForeResIntern014=3
ForeResIntern015=9
ForeResIntern016=3
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