Hi first time turntable owner here- I purchased and setup an Audio‑Technica AT-LP120-USB through line/auxiliary. I calibrated everything via the manual’s instructions and replaced the felt mat with a leather mat (Jake’s Leather Turntable Mat from Amazon.) 1) While I am very pleased with the overall sound quality, there is a very noticeable and constant static background noise. For example, during the beginning and ending of songs (when the music is low,) you can hear the static over the song. These are brand new records that I purchased and wiped clean with anti-static fluid before playing. Any recommendations on what I can do to eliminate some of the static noise? 2) Should I place the leather mat directly on the platter, or on top of the felt mat that came with the turntable? The reason I am asking is because this leather mat is actually thinner than the felt one, and the vertical adjustment on the turntable is already at zero so I do not believe I can lower the tone arm anymore? Is the width difference insignificant enough to where it shouldn’t matter? FYI this is the mat- Amazon.com: Premium Leather Deer Hide Turntable Mat: Musical Instruments » Your opinions are greatly appreciated, thanks in advance!