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Re: More Buttons
If you don't need more than eight buttons, and you need to be able to detect each of them independently from the others, recall that you have four analog ("axis") inputs in addition to the four switch inputs. Your idea for using resistors is fine; you just need to connect each button/resistor to its own joystick connector pin.
There is also the option of using the redundant switch connections available on two of the joystick ports. You can "steal" switch inputs from one joystick and use them via a different port. See the OI documentation for details on which ports support this.
By the way, congratulations on a very good question! You've stated the problem well, and your comments show that you've thought about the solution and you understand the issues.
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