Reading the HyperNext manual #2

[Richmond Mathewson]

  "HyperNext  supports  note  playing  based  upon QuickTime Musical 
instruments. On
Windows machines note playing requires QuickTime to be installed. There 
are 128
instruments available and a list of their names can be accessed using a 
HyperNext
function.
  Three different approaches to playing notes are supported. The first 
two are useful for
playing single notes whereas the third allows melodies or sequences of 
notes to be
defined and played. At the present time HyperNext only supports one Note 
channel so if
a melody is playing then any PlayPitch or PlayNote command will be ignored.

(1)  Notes can be played individually using the PlayPitch command which 
specifies the
instrument, pitch, velocity and duration. This method is useful for 
allowing the user to
play a particular note, perhaps via a keyboard displayed on a card.

(2)  Notes can be played individually using the PlayNote command which 
specifies the
instrument, octave,  note, velocity and duration. This method is useful 
for allowing the
user to play a particular note, perhaps via a keyboard displayed on a card.

(3) Notes can be played as group using the MelodyPlay command. This is 
more powerful
than the PlayPitch/PlayNote commands and gives greater control over the 
musical
output. "

OK, Peter, leveraging QuickTime instruments wouldn't be much cop for Linux
(but, that - as my Grandfather used to say - "is a coming man already gone).