Sorry for the delay in replying to this post.
I have just uploaded Mad Robots AI v0.2alpha. This has the mrSoundmeter component included. I'm in the process of making an example app but for it but it is quite easy to work out how to use. If you would like to have a go please visist my website
www.themadrobot.talktalk.net and click the red button in the top right hand corner of the webpage "
Start Creating Now" you will also need the Mad Robots AI companion app which you can get from google play here is the link
https://play.google.com/store/apps/details?id=edu.mrai.appinventor.aicompanion3Please note I haven't yet released the build server yet but that will be coming.