Possible Clues:

• Painter of unusual old instrument once
• Direction to players to reduce noise — part of one I composed
• Claim to fame - possibly in arranging New Order, for starters, loudly initially, then softly
• Tends to be fortified with energy by soft type with old musical accompaniment
• Strong suit with set of keys sounds loud then soft
• Old source of music in two volumes, the first being bigger
• Pro knocked over particular man's old keyboard instrument