Art, can you explain further Vectoring is done? David Seubert UCSB >Also, it's important to not assume that any given groove is >"vertical". As with all mechanical devices, tolerances are involved. IF >a groove induces a stylus to meaningfully oscillate at some angle other >than true perpendicular (+ or - the theoretical standard), then unnecesary >low and high frequency noises will occur. This is remedied by continually >adjusting the phase relationship of the stereo cartridge being used to >track the grooves. I call the process "vectoring". It's extremely >beneficial for ALL monaural grooves.