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.
Daar sal natuurlike variasies in volume tussen lesers wees. Verwerp slegs die opname as die volume so hoog is dat die opname breek, of (meer algemeen) as dit so laag is dat jy nie kan hoor wat gesê word sonder verwysing na die geskrewe teks nie.