> Is it possible to create something like Lever Meter of a recorded signal, eg from a microphone?
Yes, of course.
Please take a look at SimpleRecorder demo in uos/examples/
You may also take a look at source of the recorder of StrumPract project:
https://github.com/fredvs/strumpract/blob/master/src/recorder.pasThe binary is here:
https://github.com/fredvs/strumpract/releasesFre;D