The USB voice recorders have a configuration file called MRECSET.TXT:

TIME:17:38 2022/3/18^M
VOR:3   //Voice activated setting (0--7) 0 is off, 1-7 is voice activated on, the larger  number is, the more sensitive will be.^M
BIT:4   // Bit Rate Setting, 1 is 32K, 2 is 64K, 3 is 128K, 4 is 192K^M
GAIN:7  // Recording Sensitivity (1--7) The larger number is, the louder recording sound will be.^M
PART:60 //Recording File Segmented Time (10--240 minutes). Example: 60.^M

Be careful not add other characters and spaces to the TIME entry. The TIME setting appears to take effect as soon as the file is written.

Recordings are stored in the RECORD directory. Assuming the recorder is plugged into mugwort, recordings can be moved onto sage using:

sudo -i
mount /dev/sda1 /mnt/tmp
rsync -av /mnt/tmp/RECORD/* fog@sage:/home/fog/Recordings
rm /mnt/tmp/RECORD/*
umount /mnt/tmp

Recordings can be played using vlc.