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If you’re any good you do that with your chops.
The tuning slide is for resonance.

Put your whammy on this rock guitar solo from Bohemian Rhapsody (47 to 55 down an octave for mere mortals as this IS a trombone part), made famous by Brian May, before you get in your AMC Pacer, roll down the window and and ask to pass the Grey Poupon.