Thanks, G4m4. I have applied a reverb using the audio volume and now the reverb is intermittent in response with majority of the time not working. On most occasions instead of reverb i get a sound glitch like theres a bit rate confliction regardless of what audio sample i use. my audio clips are 16bit stereo .wav.
i’m using Unreal Version: 4.9.0-2672455+++depot+UE4-Releases+4.9 on a Macbook running Yosemite 10.10.5