Energetic mixologist James Zabiela is part of a trio of acts that help complete the bill for this year's South West Four.
Above And Beyond will make their debut at the event as will Darren Emerson, who will play the Global Underground Stage.
Sasha And Digweed will headline the London festival, making it their only UK performance as a back-to-back duo in 2009, with David Guetta, Eric Prydz, Mark Knight and BT also confirmed.
Click here to see the latest South West Four line-up.
South West Four (SW4) 2009 will take place at Clapham Common on 29 August.
Early bird tickets have already sold out by general sale passes are on sale now priced at £40 (plus booking fee).