Yes, it has an audio-only recorder. Nevertheless, its quality is somehow smaller than the audio that accompanies the videos - don't ask me why. The audio recorder might be specifically designed (aka freq-cut) to record human voice, or the bitrates are lower, or don't know what, but it doesn't sound as good as the vids.
By the way, I once recorded excellent audio quality (I didn't have my recorder with me) with a pair of external mics, using a cable like this:
So it forces the phone to use the cable as mic; then a cable like this:
And then a bbox plus a pair of mics plugged into that 3'5 female. Excellent result for not having a dedicated recorder!