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It is important to minimize background noise (hiss) as much as possible. This includes ambient noises such as road
noise and slamming doors etc. but also try to keep fan noise and similar to a minimum.
When played back by the MCU, samples with background noise are very apparent.
If possible, record all voice prompts in one session. This will ensure that all voice and background conditions remain
constant and the recorded voice will sound similar from prompt to prompt.
Record prompts using a relatively constant loudness of voice. Although it may take some trial and error, the best
recordings will result from speaking loud enough that the voice is recorded loudly compared to any residual
background noise, but not so loudly that it sounds distorted when played back.