Background: Seether are a South African rock band founded in May 1999 in Pretoria, Gauteng, South Africa. The band originally performed under the name Saron Gas until 2002, when they moved to the United States and changed it to Seether to avoid confusion with the deadly chemical known as sarin gas. Disclaimer is their original album and major label debut. They gained mainstream popularity in 2002 with their US Active Rock number one single "Fine Again", and their success was sustained in 2004 with the single "Broken" which peaked at number 20 on the Billboard Hot 100.
Context: The band's follow-up album, Karma and Effect, was released in May 2005. Originally titled Catering to Cowards, the name was changed at the record label's demand. "Karma and Effect" debuted at number 8 on the US Billboard 200 album charts, and was certified gold in the US and Canada. The album spawned three singles, "Remedy", "Truth", and "The Gift". "Remedy" reached number 1 on the US Mainstream Rock Charts, Seether's first number 1 hit.  Seether released an acoustic CD/DVD set titled One Cold Night, recorded at Grape Street, in Philadelphia, on 22 February 2006. Morgan had been suffering from a stomach ailment, and decided to do an acoustic performance of their set rather than cancel the show. The exclusion of "Needles" and "Burrito" from the album is due to the label's desire that it contain no obscenities.  Lead guitarist Patrick Callahan's departure from the band was announced in June 2006. No reason was given, but he apparently did not enjoy Seether's new material. Shaun Morgan commented:  "Um... relieved a little... actually a lot. He was the guy in the band that was always our naysayer, and he was the negative energy as far as writing. I personally have no love lost, which is weird for some reason 'cause he was my friend for four years. But when he walked out, it kinda walked out with him."  Morgan entered a rehabilitation program for what he felt was "dependence on a combination of substances" in August 2006, which forced the band to cancel a tour with Staind and Three Days Grace.
Question: Did the band collaborate with any other artists during this period?. Whats the answer?