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This control has a degree of intelligence built in.
If a part is on, then sending 0 will switch it off and sending 1 will switch it back
on. These are absolute actions used mostly when doing resets, state and patch set
loads etc.
If you send -1 when it was on, it will again switch it off. However if it was
already off, sending -1 will set the internal counter to -1. Yet another -1 will set
-2 etc. Anything less than 1 is regarded as off. If you later send 2 the counter
will be stepped up again. In this way, if several routines switch a part off it will
only be switched back on again when all of them switch it on.
The counter has a maximum value of 1, so repeatedly sending 2 once the part is on
will have no effect.
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