Audio Engineer training?

Has anyone heard of a recording/audio engineer course on CD? I remember reading about one years ago but lost the information. I'm wanting to brushup on my ear and pick up some tips I may have forgotten or allowed to get rusty. I seem to remember a portion of one course on CD that convered a complete frequency ear-training lession group which helped you better distinquish frequencies. In a general sense I can do that now (i.e. That sound is around 4khz, 10khz, 400-800hz etc) but I'd like to be able to determine during a sound reinforcement job, that a feedback ring that's developing is at 2.5k for example.

In recording situations I need better skills at determining that a recorded voice for example, needs a 800hz 3db cut and boost at 3k. Mind you, I do very well now, and have gotten praise from fellow studio engineers. I just want a better ear so I can listen to a sound and "know" what needs to be done, rather than hand tweak the sound for hours until it sounds the way I want.

Any references appreciated. BTW, I seen all the school-type engineer courses available. I'm not interested in the school/teacher approach. I'm looking strictly for a CD/DVD set.

Thanks
Tim