Thanks for the additional information. That’s what I suspected----these units work best with simple, basic chord progressions. I’ve watched the TC-Helicon demos with guitar and vocals. Most are playing basic chords for several measures, without any quick changes. Most are singing pop/rock material, which is not my thing. What about tunes that have 3 or 4 chords per bar, with jazz-like voicings? Many of the standards I play have some pretty slick changes. I’d like to see a good vocal harmony demo featuring tunes like that.