Miracle cure for a bad singing voice - Tascam TA-1VP + Tripler

Eleanor Rigby by Lennon & McCartney My voice can sometimes sound OK but never very good, and sometimes it can sound very bad. Even though I have a good ear for pitch, I sometimes drift off pitch especially when I am thinking about the next chord to play on guitar, or the next words to sing. A pitch corrector can be a miracle cure for this. Throw in a doubler, or 2 doublers (I have an EH Vocoder and a TCH C1 that I use as doublers in series to make a tripler feeding another mix channel), and your vocals can sound almost as good as Lennon and McCartney. This song is impossible for me to sing without my vocal processors. It actually has a high A note that I can barely squeal out. In fact all the notes in the intro bridge part are really out of my range, but they sound pretty good through the Tascam and triplers (the Tascam also adds compression, expansion, de-essing, and EQ). A complication of this song is that the verse and chorus need to be set to chromatic key, but I desperately need the key of G during the bridge parts because the notes are so hard for me to hit. So I use a footswitch to step through presets to set the right key mid-song. Unfortunately, in the middle of this take I double tapped the footswitch and got in the wrong key. So I had to reach down in between chords to turn the preset knob back, because the footswitch only goes forward.