The noise may be that the left hand presses the string incorrectly and the finger touches other strings. I don't think it's the sound quality of the guitar. The cheapest promotional piano can also clean the sound. Sound quality is just a matter of whether it sounds good or not. Also, when sweeping the strings, it is suggested that the pick should be "two inclined": first, the pick should not be parallel to the strings, and it should be inclined downward by about 45; Second, the pick should not be parallel to the horizontal plane. When the string sweeps down, the pick tip will tilt up by about 45, and when the string sweeps up, the pick tip will tilt down by about 45. I don't know if I made myself clear.