Links
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Circuit Bending:
weltenschule.de/TableHooters/Casio_CT-410V
learned a lot of stuff here about the MT-68, but had to read it a few times to grasp most of it
elektrotanya.com/casio_mt-65,mt-68,mt-100,ct-405.pdf/download
Shematics and Service Manuals, very usefull
www.circuitbenders.co.uk
A Good starting point and a nice forum, espc. the info to the Casio SK-60 (A very funny sampling keyboard) helped me there
Demo of the bend MT-68 on Youtube