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[sam]

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[mellinger]

Hi,

I have difficulties understanding your question.

When you write your own application in C#, displaying your own speller matrices, then your application can display any matrix it likes.
When you integrate your own application with BCI2000, such that the BCI2000 P3SpellerTask displays matrices, the P3SpellerTask documentation will tell you what you can do and how to achieve it:
http://www.bci2000.org/wiki/index.php/U ... pellerTask

I do not understand what you are referring to by "main matrix". There is no such thing in the BCI2000 P3SpellerTask. Only one matrix may be displayed at a time, but it is possible to switch between matrices. The term "submatrix" refers to the fact that matrices are configured in form of a matrix-valued parameter, and multiple speller matrices are represented as matrix-valued sub-parameters within that matrix-valued parameter.

HTH,
Juergen