A speaker that had enough power reserves to faithfully repro duce powerful tutti passages as well as the subtlest pianissimo.
An eerie, moonlit pianissimo, ever repeating the same figure slightly changed, slowly grows and accelerates to a ff sonoramente.
Repeat starting pianissimo and making a crescendo to forte and then a diminuendo.
His delicate pianissimo, the ever-changing modifications of tone and time were of indescribable effect.