Hello! I have a pp2+and a iso-5(13 total outputs) to power the 13 pedals on my pedalboard, however none of them are 18 volts and one of the outputs on the ISO-5 is, can I use a y-spliter to power 2 standard 9 volt pedals from one of the 9 volt outputs as long as the total ma draw is under the maximum for the power supply? And if I can do this, would if defeat the purpose of using the power supplies by introducing noise or hum into the signal? The back of the pp2+ has the additional outlet, would plugging an adapter into that pick up noise? I tried it with one pedal and a one shot adapter and it seemed to pick up a small hum but i haven't tried since. Any answers greatly appreciated, thanks!