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Practice hear letter 'L' use Koch method (practice each letter, symbol, letter separate than combine), 200 word random length, 25 word/minute, 800 Hz, 90% volume.
Use .mp3 file format because .WAV very big and no need great sound quality.
Type
Mp3 (.mp3)
Duration
10:29.279
File size
9.6 MB
Sample rate
48000.0 Hz
Bitrate
128 kbps
Channels
Stereo