Vocalist Cam Pipes was originally only invited to record background clean vocals for select tracks after the recording process was mostly complete, However the band liked the idea of having him on board full-time and so he recorded more vocals which were dubbed over the rest of the songs before it reached its release.
Initially, Cam Pipes was only asked to contribute background vocals for specific tracks after the main recordings were done. However, the band decided they wanted him on board permanently, so he added more vocals which were then mixed in with the other tracks before the album's release.