Yeah, doubling voices with internal and external sounds (arps and non-arps) is useful. I have done that, too. On a related note,it is also possible to use your e-mu as a stand-alone arpegiator to control softsynths and/or exyernal gear. I know I mentioned this before, but it's handy if someone has a 1 ru p2k box without any roms, say if the rom was put into a Command Station. Just a thought as long as we're talking aboutvexternal uses for arps.