In addition to the head mouse (see associated tip) the user controls the computer with an extra sip/puff control. Both sip/puff controls sit on the same headset. Using the joybox (see associated tip) and its software he can choose the two functions he wants to operate with the sip/puff control. The device can be set up to control an individual key or a string of keys.
His brother helped him mount the extra sip/puff control on the headset of the other sip/puff control. At first he had one control on each side, but he found that it was better to have them on the same side.
The user’s brother
Origin Instruments, www.orin.com (last checked Febr. 2017)
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This tip is from 2007