1. Mixing a slightly delayed signal with a direct signal, to simulate the effect of twice as many recorded instruments. 2. The generation of a large amount of second-harmonic distortion owing to a nonlinear motion of a speaker cone.
"Thanks for taking the trouble to do such a beautiful job on so small an item. All my LP remastering will now be headed your way (piecemeal). Although I was able to hear some tape hiss, the music sounded much clearer and more natural -- closer to the original recording. Thanks again for a great job. Brockett sings again!"