While its true that you won'[t have control of mechanical filters from the front
pannel as you do with the 570, you can use the shortcut manu which makes it
easier to deal with and doesn't require stepping through all the menus. I've
found the dsp to be quite adequate.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html