Dear LogicPD support team, 
we are recording live audio through a microphone using the Torpedo internal codec. The microphone is connected to the MIC_IN (J31.24) pin ( see image: https://db.tt/uztzNrhQ ). 
The recording has been made with the following command: 
# alsa_arecord -d 10 -f S16_LE -r 44100 filename.wav 
There is a constant background electrical noise in the recordings. 

We have recorded two samples: 
1) with microphone plugged: https://db.tt/GIbPiw9a 
2) without microphone: https://db.tt/peI6ZPbJ 

The noise is present in both the recordings. 

Do you have any suggestions on how to solve this problem?