Good work. For strings, try fo.Q tape. Remove speaker gaskets (if any) and put thick fo.Q tape in place. Then cut pieces of fo.Q tape and stick them on the speaker basket (frame).
fo.Q is a special piezoelectric vibration damping tape. Unlike most vibration dampers it does not suck out the life and dynamics. Instead it eliminates only the smallest micro-vibrations. The result is even more presence and detail is revealed. Instead of massed strings sounding like massed strings it sounds more like what it is, a lot of individual violins. Instead of one violin playing one note it sounds more like what it is, the multiple strings of cat gut being drug across the violin string creating a whole series of tones with just the right attack and bite to let you know its really a violin.
Piano is tough because even just one note is three wires tuned just different enough to never be a pure tone, and in a frame so big the whole thing is made to resonate. Just looking at a piano you can see its the biggest instrument in the symphony, and sound being a physical phenomenon with the lowest most powerful sounds being physically longer wavelength its easy to see why the piano is such a challenge. Its this combination of detail with mega resonance that makes it so darn hard to reproduce.
This tape won't add anything, but it removes so much crud you had no idea was there you won't believe the improvement.
