Back when the movie American Satan was in production, it made complete sense to have  Remington Leith sing vocals for the character of Johnny Faust, for 2 reasons:

1) Andy Biersack, character of Johnny Faust, was under the UMG record label, and using Andy's voice was not an affordable option. 

2) There was very little stage and lip syncing time, which gave Andy Biersack the opportunity to really focus on and embody the character of Johnny Faust.  

However, as I watched the Paradise City spin-off series, there was only one area of the show that didn't have me sold.  It was the lip syncing. In real life, Andy performs and sings with conviction and I feel like this time around, he was unable to tap into that while lip syncing to someone else's music/voice. I felt an honest disconnect in those scenes. 

Why do I care about seeing this change happen? I care because I loved the series, the plot, the set and the cast.  All of it was awesome, except this one detail.  So, if you want the character of Johnny Faust to be embraced 100% by your audience, I ask that you consider switching to Andy Biersack's voice for future seasons.  

Remington Leith did an excellent job on vocals for the songs and it worked well for the movie, but if you want to convince your audience of the authenticity of the Johnny Faust character, I highly recommend using Andy's singing vocals going forward with Paradise City. Especially if future episodes are going to include more dramatic scenes involving lip syncing.  

Realizing that Remington's and Andy's vocals are drastically different, I'm totally confident that Andy's talent and adaptability will produce a favorable outcome and overall make the series more successful.