The most OP letter here is a jade X, rush to get one and pair with:
extraterrestrial
extramarital
extraterritorial
exceptionally
exceptionalism
exhibitionists
exoneration
extemporaneously
extrapolations
explanations
expansionism
intoxicating
detoxifications
lexicographical
xanthophylls
overexposed
overexpanding
maximizing
maximization
approximate
approximation
=win
Any tiny bit of lag generates an offset between music and keystroke. Gave it a go with speakers off: large amounts of lag generate a skip. 1/5. Wish I could give 0.