I have something that has been bugging me since I received my 2100. Actually 2 things! First....When recording with the unit....the DSP effects button can switch off without warning. This ruins the track because there is a momentary volume dip and there is, of course, a change in reverb etc. I ran this problem by George, where I purchased it, and he just referred me to a yamaha number (not 1800!) that was impossible to get thru. He told me the boards were reliable and that there wasn't a problem. All i can say is that I had the psr2000 also and had no problems with that whatsoever...a real solid board. That brings me to the second problem....i've heard this mentioned before a long time back in here but with not much said...here goes. When recording....there can be "aftifacts" of noise that show up...crackling. It was so bad on one song that i had to run the song thru cool edit pro to get rid of the crackling....like i do with my old lps!! It doesn't happen often...but it has happened. Any ideas out there on that problem? Thanks again all out there!!