I configured a bank of 8 AM last night using Firmware 1.4.3 and config app 1.3.4 with:
Sleep duration (s) : 1
Recording duration (s) : 10
As expected this recorded onto the Sandisc Extremes a file every 11 secs right through the night without fail on all the AM.
However every file recorded is actually 9 secs long. Is this?
A bug in config App or firmware?
A oddity of writing to the Sd cards with such a small sleep?
A "design feature" to prevent small sleep settings?
Perhaps this is fixed in Config App. 1.3.5?? 😉
Another option is to record a continuous file and then chop it up. If you rename the file with a 'T.WAV' at the end, or use amplitude threshold recording with the minimum positive threshold of '2', you'll get a continuous file which you can then break into separate files with the 'Expand AudioMoth Recordings' option.