>>/21618/
 >>/21618/
> I looked it up and it seems like it's a lack of sound instead of one
no, not always.

for example if there is a thick sound (a, ı, u, o) before the ğ, you pronounce the vowel longer.

oğlu> oo'lu (like krgyz uulu)
ağlamak> aa'lamak

if there is thin(?) sound before ğ such as e, i, ü, ö it pronounced like y, but more like russian iy sound, there is no stress on it.

eğlenmek> eylenmek
siğil> siyil
eğer>eyer

etc.

lastly ğ in the end of sound, that's when you actually pronounce it as ğ. 

like:

bağ
ağ
dağ
yağ
tığ