I only played with this for a little while, but I don’t think it is very forgiving or adjusts for off key singing at all. In vocoder mode, it will work that way, as all vocoders do. It’s just taking your words shapes and applying them to the note of your instrument, so if your holding a C down (or strumming) it is all going to come out a C. As for the Harmonizer it’s going to try to track along with whatever you put in it in key or out of key.
The new EHX Vocoder coming later this year (?) has something… (can’t remember the name now… hyper-tune or something?) that looks to be like EHX’s version of Auto Tune, which will do exactly what you are looking for I’m guessing. Although it is a much despised effect out there in the world. So it’ll be interesting to see the response from that unit. I’ll buy one if this is the case, just to run instruments thru, see what happens.
