The easiest way to transfer recordings to a computer in large numbers is via WiFi. Please see the section in the Echo Meter Touch help describing transferring of recordings for details.
If you are using Song Sleuth on an Android device, you can access recordings directly from the Android file system, in Internal shared storage > SongSleuth > Recordings.
If you are using Song Sleuth on an iOS device, you can also use iTunes to transfer recordings from your iOS device to your computer via a wired connection. Please see the video below for a demonstration of this process, or this Apple Support article for a written guide.