Hi,
I'm not sure what type of distortion that would be. Typically, the one place where distortion is created is in the clipper, and the clipper in Stereo Tool is to my knowledge the cleanest and loudest on the market.
If he even hears it in test tones it has to be something else. Probably a misconfigured sound card. For example, if you send audio to the sound card at 44.1 kHz and the sound card itself runs at 48 kHz, then Windows will resample and that sounds indeed bad. To avoid that, use ASIO, WASAPI, Kernel Streaming.
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