MACD study . . . Lower Low cross and Higher High cross question

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How to script an "alert" with sound and ability to see the alerts log for the following crosses on a simple MACD study.

1. A lower Low cross of MACD to Signal (B compared to A in image)
2. A Higher High cross of MACD to Signal (D compared to C in image)

I can do the crosses easily enough but am clueless on EFS scripting to be able to understand the variables needed to implement the LL and HH part.

Any help or input would be gratefully received.

Thank you
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