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Not ground loops, no.
SOme pedals ground the +9v while others ground the -9v. If you ground something, then you can't ground the other end. In other words if you ground the - side of a 9v, then you cannot use it where + ground is needed.
Think of this supply as a battery substitute. each section creates an independent 9vDC - just like a battery. Now floating like that, a pedal circuit can ground whichever side it wants - or neither side in some cases.
SOme pedals ground the +9v while others ground the -9v. If you ground something, then you can't ground the other end. In other words if you ground the - side of a 9v, then you cannot use it where + ground is needed.
Think of this supply as a battery substitute. each section creates an independent 9vDC - just like a battery. Now floating like that, a pedal circuit can ground whichever side it wants - or neither side in some cases.
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