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For a good studio recording, the voiceover should have at least the following features:

The audio file you upload should be in *.wav format, with a sample rate of 44.100 or 48K kHz, and a bit depth of 16, 24-, or 32-bit. It should also be in mono format.
Audio files that do not comply with this format will not be accepted.
Be sure to use professional recording equipment and speak at an appropriate proximity to the microphone.
Try to record your audio at around -3dB Peak level.
The recording should be suitable for editing purposes.
There should be no room echo (reverb).
There should be no distortion and/or clipping.
There should be no artifacts or distracting noises such as clicks, pops, or audio interruptions.
There should not be more silence at the beginning or end than necessary (0.5 seconds is recommended).
It is recommended that you do not use effects on your recording. (noise reduction plugin, EQ, etc…).
There should not be any compressor or limiter applied.
Harsh breaths should be minimized as much as possible.
There should be no mouth noises/clicks.
There shouldn't be any background noise.