A block diagram of a recording console or other audio system, showing the various possible signal paths through the system, but not detailing the actual electronic components making up each part of the system.
"Thank you, thank you! Consider the 8-track from which you had to work, the job you did restoring to CD was wonderful!!! I had searched for CD's for this particular artist for some time, and did not have any luck. How pleased I was to find a service such as yours. I'll be sending the other 8-tracks soon."