Check the volume settings in your operating system. In most cases, you can adjust the volume for each application. Make sure that the volume for the Atom is set to the maximum value.
Some applications, including Atom, may have their own sound settings. Check for such settings in Atom itself and make sure they are set to the maximum value.
If you have an external audio interface or sound card, connect the Atom to it. Some audio interfaces provide a higher output level.
Consider using an external audio amplifier between the Atom and your headphones or speakers.
Make sure you have the latest version of Atom and any necessary plug-ins installed. Sometimes updates may include fixes for audio problems.
If that doesn't help, you'll have to contact official Atom support or the Atom user community for more information on possible solutions.