The ' Hall - recorder ' : sound and energy. There are two types of ' Hall - recorder ' : 1st type : with wide bore ( Mersenne ) : soprano c'' alto f' a' 440 Hz a' 440 Hz french boxwood french boxwood baroque fingering baroque fingering scale c'' - d'''' scale : f' - g''' 2nd type : with conic bore ( English flute ) : soprano c'' alto f' a' 440 Hz a' 440 Hz french boxwood french boxwood baroque fingering baroque fingering scale c'' - d'''' scale : f' - g''' All types of ' Hall - recorder ' are available with an inbuilt edge in bone, ivory or amber.