My copy of OctaSS has an AmigaGuide with quite a nice reference, but AFAICR it doesnt have a walkthrough style tutorial.
Amiga Format (or was it CU Amiga?) ran a few tutorial series with Tony Horgan, at least on the old OctaMED versions anyway. No idea which issues they will have been in though.
Are you new to tracking in general, or just OctaMED?
I too could probably make a few videos for you to show the basics and stick it on YouTube or something. Anything specific you want to know? :-)