a chord name like...

Cma7, and that has parenthesis with a #11 over a #9

and im not asking about when would you use that chord, im asking when would you use the part in parenthesis, when does that become important in a chord?
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when u play the chord, it means to play a c major 7 (C E G B) then play a #11 or a E# and play that note higher than a #9 or a D# so you would play C E G B D# E# .... atleast thats what i think, im not promising anything but im pretty sure thats it
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That would tell you to play a Cmaj7 (C, E, G, B) and then add the #11 and #9 to the chord... you'd add F# to the mix... so that your final chord will have all six notes in it.

I'll tell you though, just from reading the notes... it aint gonna sound too great... it would probably be best to use it as a passing chord or for sweeping an arpeggio.

And... just so you know. The numbers represent scale degrees of notes within your roots major scale. So... C = 1, 3, 5 (C, E, G) and it's major 7th would be B, it's ninth is an octave above it's second, but only functions as a 2nd when no 3rd is present, so (since there IS a third, it is considered a 9th, no matter what octave the note is played in), and the 11th is an octave past the 4rth (which would also just make the chord a 4rth, but since a 3rd is present it goes up to be an 11th).
if it were a C7(#11#9)... it'd be a perfect chord leading to an F chord, of any sort. Lot's of tension and release goin on there.
yeah i know about the scale steps and stuff, but would you call it that because of the sharp 11th and sharp 9th....nevermind, i think i just answered my own question