Love the app. Works great.
To those saying it doesn’t work in GarageBand or Cubasis, you have to load it differently. Rather than the Usual Interapp audio or audio unit extension, it loads more like a native effect or EQ.
So load a mic track, but don’t bother clicking the (in) symbol as you would with other interapp sources. Instead click the Effect slider button next to your track button at the top left. Then go down to Plug-ins and EQ. Click edit. You may have to remove another effect, but in the empty slot click the plus symbol, then you select audio unit extensions, then finally Harmonizer Fx will show up. Once its loaded, be sure to enable it, then simply double click to engage it.
Enjoy. Thanks for the Excellent Vocal Processor!