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.
Ku ta va na ku hambana ka ntumbuluko eka vholumo exikarhi ka vahlayi. Ala ntsena loko vholumo yi ri ehenhla swinene lerova rhekhodo ya vona i tshovekaka, kumbe (hi ntolovelo) loko yi ri ehansi swinene lerova u nga swi koti ku twa leswi vuriwaka handle ko kombetela eka tsalwa leri tsariweke.