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"I received my 3 CDs that you made from my cassettes. The sound quality was much better than I had expected. My songs had a lot of strings in them and a clear / high note sound was very important to me. Your CD copies kept the strings nice and clear with sharp tones just as I had wanted. Thanks, good job!! I also noticed where some LP pops and ..."

Error signal

A voltage that is proportional to the difference between an actual and a desired condition (as in a servo motor system). The error signal brings the system back to the desired operating condition.