Hi Larry,
as mentioned by verdantaudio, once you have created and saved your DSP-setting profiles you can assign them to your remote (number 1 - x).
I personally don't use it, as my listening room is quite good and the overall chain neutral as well.
D'esser may help with some "bright" vocals, but I prefer to fix the source and not getting EQ-crazy ;-)
P.S.: I've just sent my 501 to Switzerland, because I get my upgrade 4ch upgrade, which I'm quite excited, after talking with Daniel & Joschka Weiss. It will be around €2.800 ... here are the details. I'll not using 4channel feature, but the overall update on the analogue section will be the next level for the 501 ;-)