Hi all,
I had this issue and spent the guts of week trying various resistors on the input/output jack, it made no difference. After googling “neo clone 3pdt” or words to that effect (quite without hope I might add) I stumbled upon this post:
The image shows a very simple soldered wire between lug 7 and the ground (?) on the switch circuit board. I did this mod and it got rid of the initial power on ‘POP’ noise! There is still a tolerable ‘click’ that my other EHX pedals also exhibit, but I expect that, and it is not a speaker or ear damaging thud unlike before.
I urge anyone having this issue to give this a try and see if it fixes what to me seems a design flaw in the small clone & neo clone.