54 CHAPTER 5Concept and Operationically switches to this level indicator mode whenthe selected SINGLE program accesses the ex-ternal audio inputs. The LEDs will flash rapidlyto indicate that the inputs are being overloaded.You should dial in the proper level on the devicethat is sending the analog signals. The reasonfor that you want to feed the highest possibleclean signal level to the analog-to-digital con-verters of the VIRUS so that they will deliver thebest possible performance. INTERNAL AUDIO ROUTINGAUX BUSESThe VIRUS is equipped with several analog out-puts and inputs. We figured that you might wantto connect an input with an output via a patchcord so that you can process a part routed tothis output via another part that is addressed bythis input, for example, to have on part filter theother part.You can do this if you like, but the good news isthat you don’t have to mess with patch cordsbecause the VIRUS gives you internal signalrouting options in the form of stereo aux buses(bus is another term for circuit) that let you con-figure this type of set-up for two or several ofthese PARTs. The two aux buses appear as vir-tual outputs in the OUTPUT Select menu and asvirtual inputs in the INPUT Select menu. InMULTI mode, the output signal of a PART (orseveral PARTs) may be routed via OUTPUT Se-lect to one of the two aux buses. In order tomake this signal audible, you must select thesame aux bus for another PART (or severalPARTs) via INPUT Select and set the given SIN-GLE program to Input mode (Static or Dynam-ic). You can then process the signal patched into this PART via the aux bus exactly the sameway you would process conventional analogsignals routed in via the external input.There is, however, a simpler option than this rel-atively involved processed of connecting PARTsdirectly to one another: You can also use one ofthe aux buses as a ”second output” for thePART. We’ll look at this function a little later inthe section ”SECOND OUTPUT”.THE AUDIO OUTPUTSIn MULTI mode, you can choose a mono orstereo audio output in the OUTPUT Selectmenu independently for every PART. The signalcan also be routed to the aux buses that werediscussed earlier.In addition, you may also define a second monoor stereo output in the SECOND OUTPUT menu(under the MAIN EDIT menu). This second out-put is global, in other words, it applies to allPARTs. Using the SECOND OUTPUT Balanceparameter, you can set the levels at which theoutput signals of the PARTs are routed to thissecond output individually.In conjunction with the conventional output ofthe given sound, you end up with a quadra-phonic signal that is suitable for Surround appli-cations. Using Panorama (left, right) and theSECOND OUTPUT Balance (front, back), youcan create a genuine quadraphonic mix in theVIRUS and automate it via a sequencer.When you opt to use one of the aux buses as asecond output, the aux bus can also serve asan FX loop. You can route the aux signal to aPART and have the PART process this signal(via filters, effects etc.) further.