How many times have you got this fancy new (or old) effect that doesn’t use the standard 9V negative center? And why is it only effect boxes that uses negative center while everything else use positive center?
And you should also have an isolated power to avoid hum and other nasty stuff.
So.. what to do?
Make something that works with all combinations. Actually quite simple.
What we did is to make it simple for you. Put your adapter in and it will work. Isolation is taken care of inside the box. You don’t need the isolated power supply. You can use the daisy chain and no worries.
And you got 18V headroom inside the effect. That’s quite ok. Should be enough for most of us.