The mouthpiece has three sip/puff holes plus a lip button sensor.
The lip sensor activation and sensitivity is adjustable from a slight movement to up to one-half inch from the inactive position. A thumbscrew allows the lip sensor to be placed in a comfortable position. The Sip/Puff tube openings in the mouthpiece can be individually selected or used in combination, by positioning the mouth over one, two or three holes.
With a three hole, Left, Center, Right, mouthpiece, this allows for six different hole combinations (L, C, R, LC, CR, LCR). Multiply that by two pressure polarities (sip/puff), and two different pressure thresholds (soft & hard), for a total of twenty four signals to be obtained from the mouthpiece Sip/Puff sensors.
While less frequently used, the sip/puff tube to the right of the mouthpiece can also be used as a sip/puff input in configurations that do not require multiple mode sheets, giving an additional four combinations.
An additional four sip/puff combinations are possible if the user can cover the center hole with their tongue while sip/puffing on the outer two holes (LR).
In practice, a small subset of the combinations is typically used but the capability is there when needed for special situations.
The soft/hard pressure thresholds and the time delay for detecting a soft Sip/Puff are adjustable by the user.
The following table contains the names of all the Sip/Puff inputs for a three hole mouthpiece, with a brief description and if the adjustable delay timer is used to detect the input (This is a factor when determining suitable inputs choices to avoid slowing reaction time during game play):
