Gut strings make noise from the left hand, and this is very noticeable during recordings. All early instruments make noises like this, like our 17th century organ makes clicking key noises. It is part of the sound. You can rub the string with a walnut, as the treatises advise, but I would recommend you enjoy the sound If you are getting actual notes, then there is something that has to do with the finger roll on and off. Roll on, roll off for quiet; place on, roll off for speed. There is also a technique for placing the fingers with a sideways roll for all shifts. dt
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