ScaleTool ScaleTool - a powerful Scale Generator for Keyboards (Piano, Organ, ...) and Fretboards (Guitar, Bass and many other stringed instruments). Cost: $7 Buy full version       Trial version       Publisher: Subject: Music     Descriptions ScaleTool: ScaleTool - a powerful Scale Generator for Keyboards (Piano, Organ, ...) and Fretboards (Guitar, Bass and many other stringed instruments).