An interesting feature of the ProOne is the option of coming in the classic antique finish, which is also cryogenically treated.
Both the untreated and treated versions of the instrument tend to play with low resistance, and both are able to provide a versatile sound that can be applied to different play styles and musical genres.
The biggest differences come in the timbre between the two.
The untreated ProOne tends to have a smoother and rounder sound while the treated ProOne tends to be more resonant. These differences can be heard while playing, but tend to be more pronounced as a listener.
ProOne Cryo Alto Chromatic Scale
ProOne Cryo Alto Work Song
ProOne Normal Alto Chromatic Scale
ProOne Normal Alto Work Song