In SC if you are referring to torpedoes set to passive mode launched at say 35 knots to enable them to hear potential targets, accelerating to 55 knots when they acquire a target, I think that was an SCX modification. Whether a similar mod change exists for DW I couldn't say.
Nemo
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"I'm afraid there is no disguising the fact that King's obsession with the Pacific and the Battle of Washington cost us dear in the Battle of the Atlantic".
Sir John Slessor GCB, DSO, MC, DL
AOC-in-C Coastal Command RAF
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