Analog output gives a close range of values
Arduino is a lot of fun, but you better stay away from such modules.

The module is a resistor and a electret microphone. There is also a comparator for the digital output. When you have an electret microphone, and add a resistor of 4k7 or 10k, then you have the same.

The signal from the microphone is not amplified and the Arduino only gets the analog value of the audio. The module does not measure how loud the audio is.

I think Velleman makes them: www.velleman.eu/products/view/?id=435532
They are so kind to have a schematic available: vma309_scheme.pdf

Can you move on and use the Arduino for something else?
This module with this microphone is probably not going to work.
If you want to measure the sound level, then perhaps you can make a circuit yourself or buy a better module.

The "Sound Pressure" is how loud audio is.
The most used standard is called "Sound Pressure Level" or "SPL" and is measured in dB (deciBell).