Currently using Raspi 4 and Digi-One Signature. Getting distortion when playing music. Have used 2 different DACs and still getting the same thing. Using a SHANTI Dual Linear power supply to power the unit. The issue is down to the Rasp 4 and Digi-One. How can I test this to be sure? If so, what remedies do I have to correct this situation. Thanks in advance.