Mention recommended sample rate

[thewh1teagle]

with / mono / bit depth / ffmpeg command

[Fannovel16]

Mono, bit depth: the norm seems to be 16 bit, sample rate 24khz (or higher depends on sample rate in config.yml), file format: PCM .wav
Example FFmpeg command:

ffmpeg -i input_audio.mp3 -acodec pcm_s16le -ac 1 -ar 24000 output_audio.wav