Musical conlang query

Sorry to interrupt the various English usages/pronunciation threads going
on at the moment, and talk about conlangs  :)

As some may know, the idea of a 'musical conlang' has long fascinated me -
probably ever since the episodes in 'The Eagle' comic in the 1950s when
Dan Dare, "Pilot of the Future", and crew visited Mercury and found the
inhabitants there speaking a language consisting only of the five 'classic'
  vowel spoken (sung?) on different notes of the tonic sol-fa.

I had long been under the impression that Jean Fraçnois Sudre's Solresol
of 1866 was the first known 'musical conlang', but I discover that a
certain Monsieur de Visme published in 1806: "Pasilogie, ou de la musique
comme langue universelle". Does anyone know anything about it?

Ray
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http://home.freeuk.com/ray.brown
ray.brown@freeuk.com
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"If /ni/ can change into /A/, then practically anything
can change into anything"
          Yuen Ren Chao, 'Language and Symbolic Systems"