Analog inputs on the NI SPEEDY 33

I am working on the DSP module NI speedy 33. I would like to know if the analog inputs can be used to connect a rotative button which can give an analog signal, and then
be used in the VI. Maybe it sounds like a silly question, but when i read some documentations, in the analog inputs paragraph, they always mention only  that you can, through analog input,
connect some daughter modules, that's it. So, i am a bit confused about it. Anybody can help me on it ?

Reading from the manual found here http://www.ni.com/pdf/manuals/371577b.pdf, on page 21 of 43 it talks about the J4 and J6.
"A set of two connectors, J4 and J6, make up the standard expansion analog I/O connectors, that can be used for optional daughter modules. The daughter modules can be used for applications requiring different A/D and/or D/A functionality than that provided by the standard 16-bit stereo CODEC normally found on the NI SPEEDY-33."
That makes me think that using bare J4 or J6 is not possible.  Anyone else ever find a way around this?
Brian K.

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