[HELP] Get sound and Play it

Hi~I just fall in trouble, because of the Voice Input and Sound Play

First, searching the forums and Q&A center, I get a function in the Lib to make Voice into UE4.

EVoiceCaptureState::Type GetVoiceData
    uint8 * OutVoiceBuffer,
    uint32 InVoiceBufferSize,
    uint32 & OutAvailableVoiceData

thats it

But how can I play my sound? I search in API Doc, every SoundPlay funcs just need Class USoundBase as the parameter.
I can just get a VOICE BUFF or a pointer fo voice data, there aren’t any funcs deal with my question.
Thus, who can help me?
Please ignore my pool English, thux:p