I bought the Boss PS-6 used from Reverb and I think it’s going to work great. Does just fine with harmonizations at common intervals assuming you set the key right, even tracks well across vibrato and bends. But beyond that, it’s a double pitch shifter that lets you bring multiple octaves in, and control how much dry/wet you get so you can make pseudo bass or 12 string sounds. Then it’s got a detune mode where you are shifting by cents with an LFO involved and it makes a really fine (not just passable) stereo chorus. And if that’s not enough, it’s got a whammy mode so you can kinda sorta do the Tom Morello thing.
A few things that are likely not going to be ideal: 1) the interface and fonts are tiny, will be hard to tell what you are doing unless you get on your knees or memorize the layout. 2) if playing modally, you are going to need to transpose to the relative major scale. If you want to harmonize phrases from D mixolydian, you have to set the key to G major. If you know your modes, not a big deal. 3) Only supports the major scale and its modes. You aren’t going to harmonize a phrase from the harmonic minor scale.
It’s definitely going to make the board. I will likely have it always set up to be a chorus, and I’ll use that a lot, then set for harmonizations or octaves for songs where that would be useful.
Clip to hear what it all sounds like.
IMG_1737.mov