In 2006, Valo played bass and sang back-up on "Welcome to Carcass Cuntry" by Jeff Walker und Die Fluffers, and made guest appearances on albums by Cradle of Filth and Isabelle's Gift. He also performed two songs for the Finnish compilation album "Synkkien laulujen maa", one of which was a duet with Kari Tapio. In August 2006, Valo joined Anathema's Daniel Cavanagh on stage twice for a performance of "Inner Silence". In 2007, Valo made a guest appearance on Manna's album "Sister", and performed the song "Summer Wine" with Polish-German actress and singer Natalia Avelon for the film "Eight Miles High". The song eventually went platinum in Germany.