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Vocal Harmonizers

The intelligent ones require an instrument input, such as guitar or keyboard, playing chords to determine the correct harmony. Single not basslines are not going to get you very far. They'll work to a certain extent, but not that great. For example, if you play an E root note, it won't know whether it's in a major or minor key.

The only think I can think of is to go for one of the less intelligent units where you preset the key and harmony type, or one the older digitech vocalist products where you program the chord changes and step through them in time with the song.

Although saying that. The intelligent ones 'hold' on to the last chord inputted to generate the harmony. So as long as the song is a simple one, based on say a 12 bar blues, you could play a chord into it before the song starts, and technically the harmony should be correct throughout, although continuing to play throughout the song may through it off, you'd have to disconnect it after you've set the harmony somehow.

If you're playing in a band however, there's no reason why you can't take a feed off of one of the guitarists.
 
When I was playing around with my EHX Voice Box, I used to take a feed off of one of the guitars (I used an acoustic off of the parallel out on the DI box). This worked well, but with more singers being added, we no longer needed the false harmonies and I no longer need the Voice Box. :(
 
Yeah, therein is the problem for me. We are a three-piece, so I only have one guitarist, and he has an absolutely massive pedalboard. He is afraid that running another long loop from his pedalboard to me and back may denegrate his signal, since he has so many patch cables with those pedals (we're talking about 25 pedals or so).