Setting lower sample rate producing slow motion

[Kif11]

I need to encode an mp3 file with bitrate 8kbps and sample rate 8000 Hz.

Here is an ffmpeg command that produces the desirable quality:

ffmpeg -i in.mp3 -codec:a libmp3lame -b:a 8k -ar 8000 out.mp3

Modifying worker-realtime.js for mic.html example on line 22 produces the result that sounds like slow motion.

mp3Encoder = new lamejs.Mp3Encoder(1, 44100/2, config.bitRate || 123);

Update:
I found out that there was a related pull request from 2015 that was never merged
#11

@zhuker are you still maintaining this great library?