I am not sure this will help. I added a key to the command_en file (cmd146) to change the hydrophone volume. It appears that there are five levels of sound (at least in my setup and with my sound card). When I go to 25 meters or so to listen, I check the sound volume by listening to my electric engines and change the volume until I get the maximum sound and then I shut off the engines to sweep for contacts. I also use head phones to listen for contacts.
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Irish1958
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