It was the lyrics he couldn't see, he couldn't hear is own voice to maintain a tune. That is what he was mad about. He couldn't hear himself in the monitor so he couldn't hit the note.
DMB monitor tech is always stage left and I highly doubt at this point in the song that he would suddenly need a drastic change in his in ear vocal volume. This is def the lyric teleprompter.
Couldn't here is voice because the monitors were down. Can't hit notes right if you can't hear your own voice. That's why he was waiving his arm upwards over and over...so the techs would turn the monitors UP.
He was being homosexually creepy doing sexual misconduct with James Frost-Winn - a former member of Tinsley’s band Crystal Garden. So Tinsley left DMB to "focus" on his family.
DMB monitor tech is always stage left and I highly doubt at this point in the song that he would suddenly need a drastic change in his in ear vocal volume. This is def the lyric teleprompter.