I must be dim Mike...but having looked at the vArranger web site I am utterly baffled by what it is offering.
It appears to be something to do with rhythms for linking (presumably) to keyboards in some way or perhaps not.
Might I suggest to whoever is in charge of vArranger that they have a complete rethink about communicating very simply what their offering is - and on the home page...particularly as whatever it is costs 349 euros.
And that's me a professional arranger keyboard player for the past 20 years. So if they're not getting through to me who are they getting through to...as they say - rant over.
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Roger M