If I sing off-key, will all the musIQ harmony voices be off-key as well?
Yes and No. If you sing slightly off-key, and the notes you are singing change rapidly, then the harmonies will be slightly off-key as well. However, as soon as you hold a note for a reasonable period of time, the harmony voice will quickly move to be in-tune. This helps you sing better because you hear the harmonies singing the correct notes. However, if you sing way off-key, then musIQ may get confused about what note you are intending to sing, and may pick the wrong harmony note. By the way – the reason for allowing the harmony pitch to follow the short-term pitch changes in your singing is to increase the naturalness of the harmonies. Without this, harmonies tend to sound like an synthesizer rather than a real person.