2 other M-70 threads that I came across that have useful info...
Meter LEDs:
http://www.audiokarma.org/forums/index.php?threads/bought-yamaha-m-70-c-70-t-70-needs-tlc.524127/
Brutal's thread:
http://audiokarma.org/forums/index.php?threads/yamaha-m-70-thread.805670/#post-11224226
Cheers,
James
That link to my thread loops back here...?
See my sig below. When the site was redone, I had to rebuild my sig - though not all of it works.