Bought a dl1608 a week ago,
I use an ipad 1 docked and the drummer uses an ipad 1 for click track. So just to give you an example the drummers ipad is mini jack to stereo jack. Left to his iem and right to the dl channel 4.
Every now and then there is a sudden pop/bang and when he touches the screen is intermitently pops. On one occassion we thought it was hes ipad so we swapped it for another, when we plugged in the different ipad(when was already on) the ipad rebooted. I aslo notice on the level meter there is a slight signal showing even tho there is no track playing. The same slight signal shows on channels 12/13 which my nord is plugged into. This does not happen when PP turned off