Virus C arpeggiator won't trigger

[Laurence]

So I thought that if the 'arp on' LED is lit, then chords played on my midi keyboard would be split into individual notes, and played according to the virus' set pattern and bpm, and repeated until the keys are released.

however, when I press 'arp on', the LED lights up but the notes come out just the same as if the arpeggiator is off - no repetition and no splitting chords into individual notes.

I'm using a Virus C running OS5.5, triggered by a 'Kawai Hypercat' MIDI keyboard - I had the same issue with a different keyboard though.

Anyone heard of this problem before?

I don't really want to have to update my OS, as my interface doesn't have MIDI ports.

Any input greatly appreciated.