I often use ZTX for what you're trying to do. It is bundled in a large number of applications including TwistedWave, Digital Performer and ProTools. Unfortunately, you cannot just buy it standalone from Zynaptiq except as Pitchmap and that's pretty expensive.
ZynaptiqI'll try to find a way to taste that ZTX tool.
Changing instrument tracks in Melodyne more than a 3rd is a lot of work — no way do I try that with vocal tracks. Just sounds weird.
I'm realizing that.
For voice only, the AVOX plugins from Antares (Autotune) might be the best. They're available individually or as a suite. 30 day trial.
AVOX 4 Thanks, Mike, for all suggestions.