Hi,
The leading space should not matter:
```
# Scanf.sscanf "0.23 dB" " %f dB" (fun x -> Printf.printf "%f\n%!" x);;
0.230000
```
Are you aware of the `extract-replaygain` script that is distributed with
`liquidsoap`:
https://github.com/savonet/liquidsoap/blob/3350999c9efe447d8a226d59ffc061ce55004580/scripts/extract-replaygain
? It does exactly what you are describing, I believe.
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