> Meine Frage: How much difference is between those and the custom made plugs? Short answer hit the keys harder and you can hear the unisons. Long answer; no one should tune a piano without plugs. If USA OSHA knew the SPL (sound pressure level) the would absolute forbid tuning without plugs. I personally have measured SPL of 110 dB at ear level tuning the treble of a Yamaha C3. 115 dB is possible with some of those hard rock hammers. 100 dB exposure of 15 minutes is OSHA standard. Or there abouts, I forget the number but it is far shorter than it takes to tune the treble of but one piano. Get plugs, use them, and never leave home without them. Newton
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