> Piano tones from three octaves (C4 to B6) were generated using two different digital pianos (Roland FP60 and Yamaha Arius), and guitar tones spanning the same range were generated by an online synthesizer
B6 would be the 31st fret on the high E string on a guitar, which is why I suppose they had to use a synthesizer instead of a real guitar since real guitars generally have 19 frets (classical), 19-22 (acoustic), or 21-24 (electric). Guitars have been built with more than 24 frets but most guitar players will have never played one or even heard one.
Personally I'd find about half of that C4 to B6 range to be in what I consider to be the annoyingly screechy range which would probably affect my performance on the training.
B6 would be the 31st fret on the high E string on a guitar, which is why I suppose they had to use a synthesizer instead of a real guitar since real guitars generally have 19 frets (classical), 19-22 (acoustic), or 21-24 (electric). Guitars have been built with more than 24 frets but most guitar players will have never played one or even heard one.
Personally I'd find about half of that C4 to B6 range to be in what I consider to be the annoyingly screechy range which would probably affect my performance on the training.