Bass and backing vocals, backing guitar
- Morgan upright,
- Epiphone Jack Casady Signature Bass,
- Fender Jazz Bass Fretless,
- Hofner “Beatles Bass”,
- Yamaha bass,
Petter started with the piano at the age of six but gave it up for wind instruments at the age of nine. He has played the trombone in various jazz bands, such as Big Business Band in Bergen. He bought his first bass at the age of 15 and switched permanently to strings in 2006. He has played in various rock bands, such as Sudden Pitch, Lukeparking and jazz bands, among them Buskerud Storband.
Petter joined RCB in January 2015. His style is influenced by jazz and prefers the walking style, but has since the acquisition of an upright bass added some rockabilly slap to his reportoire.