"If your only using the low side of the string set & you're already used to the G-D-g type tuning, then drone the lowest or the highest string, that will create the best effect without having to learn new chord shapes? Examples: (lowest-highest)…"

"Hi, hahaha, sure you can do it. Back in the long, long time ago I learnt whole riffs by lifting the needle off the vynal record and placing it back again over, over, over and over again. But Brian's idea is less frustrating.Taff"

"Use a tuner, it will tell you what the general pitch is?"

"Hi Taff, this sounds great. Might take me a long while to try to work out the tuning from the strum, but I'll give it a go... nothing like a challenge!
 "

"https://youtu.be/rZ33yOjSsdw.
Hi I have not built many four-stringers as I found it harder to find tunings. In the clip shared above you may get an idea of the tuning that I found and liked. I can't remember the strings or the tuning I used. So, I'm…"

"Hi, yes, I've bought bits from him before, didn't think about him for sets of 4 strings, I'll check him out. Thanks
 "

"Have you heard of Chickenbone John? He has a one stop shop store for everything cbg in the UK? Including strings: https://www.chickenbonejohn.com/collections/zilpha"

"Yes, it does, very helpful, thanks"

"Yeah I figured it would at least give you some idea of string sizes to use as well as tunings"

"Hi, thanks for the info. I have looked to buy from C.b. Gitty before but I'm in the UK so by the time I add shipping and import taxes on to an order it becomes very expensive (the shipping on a set of strings which cost about $7 is $15 to the UK)
 "

"Colin,
C. B. Gitty sells the four string sets for either a DGBD or DGBE tuning .054, .026, .017, & 0.13 string sizes.
Hope this helps.
Blues Frog"

"You can add a G or 4th string, that'll give you GDGB or AEAC#? It will give a fuller sound with the smaller string? Usually GDG/AEA tuning is strings 3-4-5 & EBE/DAD is strings 456? "

"Hi Timothy, thanks for the reply, I'll gve it a go. Thanks
 "

"easy answer would be use the E string and tune it  to D . giving you DGdg but i am sure there are a number of tunings i cant think of at the moment. "