i've been really happy with my kawaii - but i guess that most older pianos are a little 'unstable' and tend to have 'floppy' action. the extra action beyond what is necessary is, imo, what makes the most unnecessary noise. then, we have strings that need tuning and/or don't stay tight. hammers that are not voiced and pieces of cotton? are making a head of the hammer like a clown's hair, or the hammers are so far gone that we're getting close to wood.imo, new pianos just sound cleaner and better. and, the bass buzz can be eliminated by tightening the action, too, right? in the bass. if it's too wobbly? sometimes the mostly 'wobbliness' comes when you put the damper pedal down and/or play to 'hammerishly' with your fingers.