public string CreateTempWavFile(string audioFilePath, string tempFolderName = "")
{
var newFile = Path.Combine(Path.GetTempPath() + tempFolderName, Path.GetFileNameWithoutExtension(audioFilePath)) + ".wav";
//create directory if it doesn't exist
var dir = Path.GetDirectoryName(newFile);
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
_audio.ConvertToWav(newFile);
return(newFile);
}