-10dBV is the standard for unbalanced devices, whose output @ 0VU with a 1k tone should be 0.316V
+4dBu is the standard for balanced devices, with an output reading (@ 0VU, 1k sine wave) of 1.23V
Theres about a difference of 2.2dB, which would explain the difference in levels you hear....which also equates to about 11.8dB more headroom when using a totally balanced system, running at +4dBu
Most synths operate at -10dBV, but for some reason I find the Virus too hot when I switch the -10 level, so I keep it at +4, and adjust levels of individual patches.....
Check the specs for the audiophile, and also the Virus......and, I guess, just try each and see which one works best for you....
