19th Dec. 2015
I have owned my Yamaha DGX-640 for about 2 years . For much of that time I have been trying to resolve some weird base sounds when the ACMP is turned on . today while nurdling around I noticed that the “Style” volume was at 75% . When I turned it down ti Zero the noises were eliminated. Sinve I do not use the “Styles” facility I went through all my bank settings and reset the “Style” volumes to “0”
Now my playing sound much better and I am happy with the output quality.
I hope this helps others as there is no help in the Yamaha manual.