Would the Isolator improve the sound quality?

The intended purpose is complete isolation of both data and power lines. In an audio application, the resulting sound quality improvement is the effect of breaking all the noise coming from the host computer.

As this is a true industrial product, we focus primarily professional applications like automation systems, medical and research labs.
But of course, as this product is designed for low noise (research labs need this to gain dynamic range from nanovolts to kilovolts) and perfect signal integrity, we understand the demand of audio enthusiasts. We highly recommend giving it a try. If you search the web, you will find lots of positive comments and reviews about it.

Thanks to our fully equipped audio lab, we had the chance to take special attention keeping the noise of the power supply output as low as possible in the 20Hz-20kHz range and we also optimized current flow using a high-speed current sensor probe that resulted in the probably industrial-wide lowest packet noise (8 kHz and harmonics).

Following measurements are showing a typical ground loop issue (first image), cured by galvanic isolation (second image):

Courtesy of Matthias Carstens, RME

See also here.