If there appears to be random parameter value changes in the sound of your 001, sometimes causing a gritty / clicky / rough texture in the sound, which doesn't affect the LCD display, this may be due to 'floating' CV-in values caused by the lack of any cables connected to the CV inputs.
To determine if this is the case, go to the Parameters->Modulation->CV-in page on the LCD and ensure that the Status parameters of all CV-in's are set to 'Off' (if they appear to be off already try toggling them on and back off just to be sure).