This is more of a tip than a mod, but in the stock game, your soundman is not very talkative. This is governed by the lines above in the "contact.cfg", which can be found in Data/Cfg.
"imprecise" (i.e. long range) contacts are updated every 10 minutes and "precise" (ie. short/medium range) contacts are updated every 1 minute. This has the unfortunate effect that the soundman will not call out contacts that you can plainly hear yourself on the hydrophone.
By changing the time in the "imprecise" line from 600 to 60 and the "precise" line from 60 to 15, your soundman will now start calling out sound contacts on a regular basis.
If you find he talks too much, which can happen if you run into a huge convoy, set the "imprecise" line number at 120 or 180.
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