Decoding Nexa 433.92MHz Signals

[tridy]

Hello.

I finally managed to record some WAV files from 433.92 remote controls by using HackRF, SDR# and Audacity. X10 signals look like highs and lows and I think it will be possible to decode them. However Nexa signal looks different, more like usual sound waves. Does anyone know how to decode them (Audacity screenshot and WAVs attached)?

Thanks.