fxsound uses a separate sound device driver, so start by checking your system volume levels (there are several). Make sure you check the volume of the desired device (when fxsound is running) so you don’t confuse it with the volume of another device.
In the second step, press the big round on-off button and check the sound with and without processing. You may need to change the selected preset or adjust the parameters.
Third, restart the Windows Audio service while the program is running. In rare cases, restarting it fixes a bug with various audio devices. I still do not understand whether this is due to Microsoft errors or to the errors of the driver developers.
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