Could you try putting this image as your Splash Animation parameter, and then using the settings Animation Frame Width = 48, Animation Frame Height = 48, Animation Speed = 10, Animation Time = 30? Maybe having a working example you can modify would be easier, so you can see how it works and edit it as needed for your own game.
Also, were you able to get the other issues you were having solved? If you already deleted the parseSoundEffectJSON lines from the code, you will probably need to revert those changes or just redownload the plugin after updating my CGMZ Core to get sound effects working again.