Tried three different VCV vocoders. This is xINC by bidoo. Mostly fixed the glitchy audio by increasing the block size of the audio I/O module in VCV - but there's still an occasional crackle. Here's the same two chords played by a variety of "carrier" instruments, modulated by my same silly vowel sounds: Cellos, a synth pad, arpeggiated electric piano, pipe organ, fuzz guitar. Each first played without effect, then vocoded.