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.
ⵔⴰⴷ ⵉⵍⵉⵏ ⵉⵎⵣⴰⵔⴰⵢⵏ ⵉⴳⴰⵎⴰⵏⵏ ⴳ ⵓⵙⵡⵉⵔ ⵏ ⵢⵉⵎⵙⵍⵉ ⴳⵔ ⵉⵎⵖⵔⵉⵜⵏ. ⴰⴳⵢ ⵖⴰⵙ ⵎⴽ ⴱⴰⵀⵔⴰ ⵢⴰⵜⵜⵓⵢ ⵓⵙⵡⵉⵔ ⵏ ⵢⵉⵎⵙⵍⵉ ⴰⵢⵍⵍⵉⴳ ⵍⴰ ⵉⵜⵜⴱⴱⵢ ⵓⵙⵓⵙⵔ, ⵏⵉⵖ (ⴳ ⵓⵎⴰⵜⴰ ⵏ ⵡⴰⴷⴷⴰⴷⵏ) ⵎⴽ ⴱⴰⵀⵔⴰ ⵉⵣⴷⵔ ⴰⵢⵍⵍⵉⴳ ⵓⵔ ⵜⵣⵎⵉⵔⴷ ⴰⴷ ⵜⵙⵍⵍⴷ ⵉ ⵓⵢⵏⵏⴰ ⵉⵜⵜⵓⵏⵏⴰⵏ ⵎⵉⵏ ⵜⴰⵙⴰⵖⵓⵍⵜ ⵖⵔ ⵓⴹⵕⵉⵚ ⵉⵜⵜⵢⴰⵔⴰⵏ.