put on the soft pedal

But we’ll have to put on the soft pedal if we hope to find out anything.

She again put on the soft pedal, and began gently to touch the piano.

"You shouldn't give such laugh-provoking stunts, then," answered Mr. Kean, "but I'll try and remember to put on the soft pedal hereafter."

"Wow, Spud! put on the soft pedal!" interrupted Sam.

Hey there, Wladek . . . put on the soft pedal.