I am trying to layer sounds in different octaves to create multi/combi patches. My VST plugins such as the Korg Digital Legacy M1, Roland Canvas VA, Kontakt 5, Structure2, UVI and xPand!2 all have octave changes. I have the Garritan Ultimate Collection and just got the GPO 5 update. My Garritan libraries will be much more useful, in my case, once the Aria player offers transpose/octave. I am hoping that Garritan will implement the feature in the next version of Aria Player. Even the free Sforzando player by Prologue which plays Garritan libraries has transpose which allows at least one octave down and up.