The rate at which a frequency response curve decreases in amplitude; usually stated in dB per octave or dB per decade.
"Thanks!! You performed a great job -- I'm extremely pleased with the quality of the sound and amazed at your fast turn-around time on it. I never thought I'd ever hear those sounds recorded over 22 years ago on an 8-track tape. Not only have you restored and rerecorded an obsolete tape, but you've also restored some wonderful memories from my ..."
