I seldom ask the BK to do on the fly transposition of more than a half step... Compared to offline computer transposition, the quality is VERY low, and a whole step sounds much worse than doing it in advance.

Plus, I do my audio backing tracks using multitrack recordings, mostly from Karaoke-version.com, who have some really excellent tracks. The advantage to this is that I can transpose the pitched tracks, but leave the drums and percussion untouched, which makes a massive difference in quality compared to transposing everything!

Unfortunately, when using the on the fly BK transposition, of course the whole thing gets transposed, and it’s the drum transients that suffer the most. What I tend to do on songs that really push my range is to prepare two versions in advance, one a half step lower than I normally need. Because the drums stay untransposed, the lower one sounds MUCH better than using the BK to shift it down.

Most of the time I won’t need it, but if I do it is there, ready to go!