Hey guys, thanks for the responses....I think I found my problem. I had my synth going through the phono terminal on my amp. For some reason years ago, I originally ran my wk-7500 this way too...maybe because I was using other terminals, tape deck etc. and not playing vinyl much any more. To get the best sound I had to set bass and treble like I said. The sounds were good...just could not turn up volume very much because it was overpowering...not distorted, just overly strong, with some popping on some hard rhythms. There must be something different about the phono jack...because last night I disconnected everything and patched the xw-p1 into an aux jack...now the synth sounds have no static pop at all...and my bass and treble controls sound good back to their normal settings. I have to raise the volume more on the amp...but it is nice and clear now.