Time to see how good your hearing is, or isn't. The following are identical songs, one recorded using the TC Helicon Harmony-M and the other directly into the PSR-S950 using the standard mic input. The mic used for both is an E-855. The only editing was to change the file from a .wav file to an MP3 using Lame and Audacity.

I must apologize for not doing this last night, but beginning about 10 pm yesterday evening, my lungs were really nasty, and they're still not great, so I have very little power in my vocals. I have nasal oxygen stuck in my nose and I had to take a shot of rescue inhaler in order to record this.

Here's the first rendition of Jimmy Buffett's Man-ana, a song that I heard for the first time about 3 weeks ago. Click Here!

Here's the second rendition: Click Here!

Now it's time for you to decide which vocal processor was used.

Good luck,

Gary

I'd say the 1st one is best

Agree, the first one sounds better.

I’m with JIm on this one 1st one I thought was better. Seems 2nd had extra reverb.

Same here - the first one. Much cleaner.

Deane

I'm going sailing first thing in the morning and taking my daughter's room mate with me. So, when I get back, I will tell you what the results are.

All the best,

Gary

Agree 1st one is a lot better.
Second one Is warbly and robotic
Jim

The first one sounds lightyears ahead of the second one. I hope its the korg

You can hope all you want... the Korg was never tested... although the harmony M is very similar to Korg's on board harmonizer..

Of course the better version was from the Yamaha harmony... But more care was used in a better signal than the TC..

I am so glad I never had to deal with either one..

I used the Harmony M for several years, and it is outstanding. The Yamaha harmonizer can be made to sound pretty good, with some work. The Harmony M also has the automatic voice processing that is included on the Korg.
In this demonstration it's easy to hear that the first one sounds best, for whatever reasons.
Part of that may be that the original voice signal on the second was much drier? Just guessing.