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If you're worried or it doesn't work, you could step the voltage down very easily with a little external unit someone could make for you - at the most basic, all you really need is a 3V Zener diode with a power rating high enough for the maximum current your pedals draw, but if you want to do it properly then a 7809 regulator would do the job - if it's coming off a battery you won't even need filter caps.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
This means that if a reverse-polarity power supply is used, the diode often shorts meaning the pedal is dead until it’s replaced - or much worse, modern high-current single power supplies can be capable of supplying enough current into the shorted diode to burn it away, which then leaves the pedal fully exposed to the reverse voltage, and often destroys it.
At least the lack of voltage protection means that a standard 9V pedal should be able to take up to 13V (the peak voltage of an unloaded unregulated 9V supply) without damage - most do use 16V caps and ICs will normally take up to 18V, so you’re normally safe at 12V, if it’s fully regulated.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Furthermore, your thoughts on overvoltage might suggest that using a 12v battery as opposed to PSU might be within the tolerance of the electronics (I wont hold you responsible to that, but its good to know about!)
Great information - thanks again.
Yes, because a battery is a fixed voltage - a 12V car battery is actually about 12.6V, and if it's not on charge it won't rise above that no matter how small the current draw.
I'm almost certain that no standard Boss pedal would be damaged by that, but I can't guarantee it!
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein