Thanks to a friend and his friend, I got to see & hear a Violano-Virtuoso last night. Many Irving Berlin tunes were played, some Jolson.
Evidently, there's also the Double Violano-Virtuoso with two mechanically played violins and a piano.
A few links:
a MIDI-fied Violano project
The Musical Museum, London
Nice photos here
The Violano-Virtuoso I saw had been recently MIDI-fied.
So rather than playing Violano piano rolls, it was playing MIDI files extracted from the rolls via a homebrew piano roll scanner devised by a group of mechanical musical instrument enthusiasts (including the owner of the V-V). The scanner, built using elements from flatbed scanners, reads a roll in increments of 5/1000ths of an inch and thereby creates both a graphic copy for making new rolls and the aforementioned MIDI file.
Hooking up to the MIDI interface a Palm Pilot full of these MIDI files, the Violano owner could easily call up tunes at will.