Persian Green Screamer Overdrive Effects Pedal. The One Control Persian Green Screamer overdrive is a laudable update on the classic green tube overdrive pedal. Exclusive BJF circuitry provides switchable distortion modes- Vintage and Modern. The Vintage setting delivers classic rich distortion while the Modern setting punches through with a perfectly clean, transparent gain boost. One Control BJF Series FX Pedals were designed by world-renowned pedal guru and mad professor Bjorn Juhl. All BJF FX pedals can be powered using a 9V battery or standard DC power supplies, and feature true-bypass switching. BJF Series FX pedals are incredibly light (approximately 160 grams) and are built using high quality, compact aluminum enclosures.