about metasound logo:
a pleyer keeps "pnefsikroustos" tubes (paper percussion tubes);
hears the sound (waves on the left) and produces sound (waves on the right).
Also, his head seems like an "O" and tubes like a greek "",
the initials for "Metasound Group" ( ) in greek.
All that produces emoticon: )))) or ))Om)) (in greek fonts are missing)...