Sustoned or Sustained: How To spell?
The word Sustoned is misspelled against Sustained, an adjective meaning "Held up to a certain pitch, degree, or level; uniform; as, sustained pasion; a sustained style of writing; a sustained note in music."
Word contains consecutive vowels 'AI' in between alphabets sust & ned is misspelled as 'O'Wrong Spelling:  sust-o-ned  Correct Spelling:  sust-ai-ned 
Check more misspelled words of Sustained to spell it correct.