Bay area rock and roll foursome Ovvl may have adopted witch-house spelling, but their sound is pure early-to-mid-’70s rawk tinged with stoner metal attitude and an occassional prog-funk vibe. Ovvl released their eponymously titled full-length last November and are back on the road. Judging from the merch section of their Bandcamp, high-minded heshers are buying what they’re selling; in addition to their full-length album, there are stickers, t-shirts and a hand-wrapped Christmas mixtape still up for grabs. Ovvl shreds at Launchpad (618 Central SW) on Friday, Sept. 6, along with stoner rock stalwart Black Maria, doom metal/stoner rock upstart Edith and blues-rock outfit The Lymbs. The amps crank up to 11 at 9:30pm, and admission to this 21-and-over earplug fest is $7.