You might want to perform a factory reset first and foremost. Press both cursor keys while turning on. Scroll through the menus till you reach 'Initialize'. Press Enter. Wait for it.
But even before resetting the unit, is it possible that you have not scrolled to the very end of the VK patchlist? There is not a different operational mode for ROM and RAM patch locations, it's just a question of order. If memory serves, patches 000-127 are RAM sounds (mainly copies from ROM sounds); patches 128-255 are empty ('default')
patches 256-511 are ROM sounds (that cannot be overwritten).
That is what you get when you perform a factory reset. A bit featureless soundset, I reckon.
However, as a more experienced Proteus user told me, VKs were sold with a different sound bank that was noticeably more elaborate soundwise and
it filled the whole RAM section with new patches leaving no 'default' gaps. (This is the soundbank I've seen demoed on Youtube, for instance - and the one my unit came with). And some time later, a third soundbank was released, that favoured 'synthier' patches.
You can download sysex files containing both banks at http://www.emu.com/support/files/downlo ... Platform=1
(for PC) or http://www.emu.com/support/files/downlo ... Platform=2
...and transfer them to the VK using a free app like MIDIOX and an interface capable of sending MIDI protocol. You don't need to select a special mode or MIDI channel in the VK to receive sysex messages.
"The concern of the musician is music. The concern of the professional musician is business. Only become a professional musician if there is no choice." Robert Fripp.