No sound, how to fix

Hello everyone.
Please help me, when connecting to a remote computer using NoMachine there is no sound, how to fix it, I will be very grateful!

Hi! There are several possible causes and solutions to this problem.
Please follow the steps below first:
Download PulseAudio volume control.
Launch PulseAudio volume control.
Go to the “Output devices” section.
Click “Set as backup” (green button next to the built-in analog stereo).
Increase the sound level.
If after increasing the volume with PulseAudio volume control there is still no sound, check if NoMachine audio devices are available in the system, see more information on how to do this here:

This is a setting on NoMachine. There are posts on the NoMachine forum for how to solve this issue.