Some keyboards have a "harmony" feature that-- among other things-- can repeat a note at different rates or beats (1/8, 1/16, etc.) when you hold down a key. However, I don't see anything like that in the manual.
If you have an iPad, there's a free VR-09 Editor app that can be used with the VR-09 and VR-730, but I don't know what its features and capablilities are.
Of course, if you have an iPad then there might be a plug-in app that can be used to play arpeggios.