Arpeggiator in Virus Rack

[Timo]

Do you perhaps have to use the Parameter buttons to scroll left/right until you find the arpeggiator Off/Up/Down/Up&Down/AsPlayed/Random/Chord settings?

I know my arpeggiator settings are in a weird place in the menus of my Indigo, not particularly easily accessible or intuitive. They improved this with the later Virus C, onwards.

If you have a PC and a MIDI interface you could always try using Emagic SoundDiver, which is a librarian and graphic sound-designer for all the classic Viruses. It was bundled free with the synth at the time.

Otherwise I'm not sure what else I can personally suggest, other than perhaps sitting down with the manual and working through it. I've never had any experience with a Virus Rack before.