How to decode FSK Messages

Hi I'm new to SDR and radio in general. I was interested on decoding the messages through a SDR dongle. 
So far I have try using `minimodem` with this configuration

```bash
$ minimodem -rx 1200 -f int16_mono.wav 
```

But seems not to pick the data correct. Would anybody have a hint on how to demodulate the messages? 
Thank you