Dave Kerr comments on some hand-played Voltem rolls he has.  I have a 
few of these and they are patently a product of the fairly brief period
when Wilcox & White and the Aeolian Company both had plants in Meriden,
Connecticut and shared a roll-cutting facility there (I'm not quite sure
whose it was but Rex Lawson has done the research and will know).  

Voltem rolls are close cousins to Aeolian's Metro-Art series which were
effectively Duo-Art minus the code perforations, plus dynamic and
Metrostyle lines.  Notice that Charles Spross, at least, was a Duo-Art
artist.

Later on, Aeolian's subsidiary in England the Universal Music Co. made 
hand-played rolls for other companies under labels such as Celebrity 
and Perfecta, some of them even sharing the same stock numbers as 
Universal's own Dxxx "Hand-Played" series.  Most but not all of these 
performances appeared as Duo-Art rolls as well.  Voltem, I'd guess, was 
a similar tie-up.  (What's Voltem backwards ... Metlov ... Metro-Art 
Lover ? ...)

Dan Wilson