You're right.
Direct cummunication is probably the only way.
Roland don't list much nowadays. They don't even post their manuals on the net. It's a shame, 'cause almost every other company does it as a standard procedure.
If I'll find out any useful information (I still know a few good Roland teks) - I'll let you know ASAP.
-ED-
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A gentleman is one who never hurts anyone's feelings unintentionally.
- - - Oscar Wilde