The Snark SA-1 9-volt power supply will keep your pedals rocking all night long and save you tons of bucks on 9V batteries. In fact, never buy a 9V battery again (for your pedals at least). the Snark SA-1 supplies a sure and steady voltage that won't effect your pedals tone and has zero hum proprietary noise filtering for absolute silent operation. Seriously, buy this power supply and you will kick yourself for not having done it sooner.
