🧠🧠🧠 Bulletproof Spy (Lost Piece Exercise)

Lost Piece Exercise: The audio will tell you the position of most of the pieces on the board. Can you work out where the missing piece is meant to be?

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FEN for today's exercise:
3nr2k/1p1r1b1p/p3p1p1/1PPp1p2/1Q2PP2/P3BN2/3RB1PP/2R3K1 w - - 0 1

And the answer is...
Qg4