Mufled or Muffled: How To spell?
The word Mufled is misspelled against Muffled, which is past tense of "Muffle"
Muffled has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Mu & led which should not be misspelled with single 'F'
Wrong Spelling:  Mu-f-led  Correct Spelling:  Mu-ff-led 
Check more misspelled words of Muffled to spell it correct.