Hi,
i know its been two years since you asked for the "Bass Mute" for a casio MT-68...
just yesterday, i put a webpage up, containing the info, in the evening i googled for "casio MT-68 bend" and found your post - so i take this as a sign to write a late reply 
let me point you to my page about my bends:
opal42.jimdo.com
Hope u didnt get rid of the MT-68 as this is a really nice little device, i completed 16 switches and 3 pots on it, but i have only added about half of that to my webpage yet. Otherwise: Happy egghunt!
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