Ok wtf is this sound? Examples:
at 3:41 in this song
https://www.youtube.com/watch?v=ns9-...n5G5no&index=2
at 14:31 onward in this
https://www.youtube.com/watch?v=GwWv-T4rM0k
and beginning at 0:35 here but hanging out in the background for much of the track
https://www.youtube.com/watch?v=acgglB9HXSA
I hear this sound crop up all the time in music from the 80's and 90's mostly, but don't know if it's acoustic or electronic in origin. Hopefully someone with more production/mixing knowledge can enlighten me here