I disagree Bill. An arranger is at least 85% software (which for most brands has evolved only glacially in the last 20 years.) How much of Giglad's spec is driven by sound and video processing? It has an elaborate visual interface with more features than advanced hardware arrangers. However, after two years of updates, its chord recognition is STILL more demanding of the player and less flexible than Roland's and Nimbu's. Specifically, Bass Inversion should be a separate option available in ANY chord recognition mode.

Style pattern transposition, chord recognition, and perhaps vocal harmony which is driven by the recognized chord are the defining features of an arranger. I'm pretty sure that Roland could render a version of its 1996-vintage RA-800 module that would run on an iPhone! Better yet, its 2011-vintage BK-7m, which STILL routinely sells for about $800 in the secondary market. A lot of keyboard players and even non-keyboard musicians would be well-served by an app like this.