Bendeth, who produced "Walls", "Therapy" and "Poison".S*A*M and Sluggo produced "Lost in Stereo" and "Hello, Brooklyn". Gaskarth said that they "kinda split up the [recording] with different producers that we wanted to work with in the past, but for scheduling or monetary reasons, we couldn't lock them in for the whole record". On March 16, it was disclosed that the band had finished recording. On March 24, the album was in the process of being mixed. Tom Lord-Alge mixed "Weightless", "Break Your Little Heart", "Damned If I Do Ya (Damned If I Don't)", "Lost in Stereo", "Stella", "Sick Little Games", "Hello, Brooklyn", "Keep the Change, You Filthy Animal" and "A Party Song (The Walk of Shame)", with the assistance of Femio Hernandez. Bendeth mixed "Walls", "Therapy" and "Poison". Brian Malouf mixed "Too Much". Alex Suarez of Cobra Starship remixed "Weightless". All of the recordings were mastered by Ted Jensen at Sterling Sound, except Suarez's remix of "Weightless", which was mastered by Vlado Meller at Universal Mastering Studios in New York. Composition Musically, the sound of Nothing Personal has been described as emo pop, pop punk, and pop rock. With the album, Gaskarth said he wrote the foundation of the songs, typically the "bare-bones" chords and melodies, before showing the rest of the band. He clarified that they usually write together as a full band, "so, most times, musically, it involves contributions from everybody". "Weightless", "Break Your Little Heart", "Stella", "Keep the Change, You Filthy Animal" and "A Party Song (The Walk of Shame)" were written by the band and Squire. "Damned If I Do Ya (Damned If I Don't)" and "Sick Little Games" were written by the band and Walker. "Lost in Stereo" and "Hello, Brooklyn" were written by the band, Sam Hollander and Dave Katz. "Walls", "Therapy" and "Poison" were written by the band and David Bendeth. "Too Much" was written by the band, Terius Nash and Christopher Stewart. Explaining why the producers were given co-writing credit, Gaskarth said "...the way in which this album was written involved me working, in some way, on all of the songs in their respective presence, while taking their professional advice. It was only fair to give credit where credit was due." Talking about the album, Gaskarth explained to Alternative Press, "we tried to explore something a little bit deeper. We're exploring some new moods, which is pretty cool." He added, "It's nice