Hardware, Desing Enclosure for Compatibility with Rotary Encoder.

[nk25719]

Is your feature request related to a problem? Please describe.
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The GPAD enclosure does not have a place for a rotary encoder knob.

Describe the solution you'd like
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Tentitively placing the rotary encoder in the old place where the speaker was.

Describe alternatives you've considered
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Find a different location.
Enlarge the board and enlarge the enclosure as per issue #124

Additional context
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