Now there's a way to use the 1 SPOT with 9V battery devices.
The Visual Sound Battery Clip Converter is a simple accessory that allows you to use the 1 SPOT 9V DC adapter to power anything that runs on a 9V battery.
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Comments about Truetone Battery Clip Converter for 1 SPOT:
I bought 2 of these to power an 18 volt pedal.Figured 2 9 volt power supplys would power it,but it didn't work.On that note,I'm disappointed but I'm sure these work fine with any 9 volt pedal.