9vdc For raspy&pisound

Hi, I uses pisound for pedal guitar projects. My problem is that for pedal guitar the standard is 9dvc, and rasp & pisound uses 5dvc.

I dont want to use more power supply so… Do you know if i could use a 9dv power supply for rasp & pisound?

Only if you use a voltage regulator in between to reduce it down to 5V. It should have 2A or higher current capability on its 5V output.