It seems the concatenator does not handle the looping sound node.
In the simple setup below, I have set the looping node to 3 cycles, and although the loop is properly triggered after “chirp_sin_880_440” is finished, and the looping sound indeed played 3 times, nothing happens next - the 3rd entry “chirp_sin_440_880” is never played.
Hey man, sorry for the late reply. I just tried to reproduce the issue you describe at head rev of UE4 and built a sound cue graph that’s looks identical to yours and it worked just fine. Here’s my sound cue graph:
I didn’t sync back to 4.7 since I don’t think anything changed in this stuff since then, but is my stuff similar to yours? There might have been an issue with sound-finished notifications or something that has been fixed. Could you try to repro with 4.8 or with the 4.9 pre-release?
I’ve checked it and get the same bug in 4.8; however, as far as I can see it seems to be fixed by CL2588668 which made it into the 4.9 branch, which would explain why it’s fine on yours.