There will be natural variations in volume between readers. Reject only if the volume is so high that the recording breaks up, or (more commonly) if it is so low that you can’t hear what is being said without reference to the written text.
Normal o ke sewîyeya vengî yê her qiseykerdoxî cîya ya. Eke veng hende berz o ke qeyd birîyeno yan zî (no hîna zaf qewimîyeno) eke veng hende nizm o ke ti nêeşkenî/a bê wendişê metnî bihesnê ke wendox se vano, tena o wext qeydî betal bike.