Some fellow musicians on a Spanish website have told me that it sounds distorted, but I don't notice it.

Would you be so kind as to let me know if you also hear it?
And if so, could you tell me where and on what instrument it's heard?
I don't hear anything above 10000 Hz,

Thank you very much.
https://www.youtube.com/watch?v=nCozOTDIgxY