| 摘要 |
A wooden box call is modified such that its actuator top can flip over in order to allow presenting either of the opposite broad faces of the actuator top for rubbing against a sidewall edge of the box. The actuator top is preferably a composite or a bi-material in the sense that it is made of two different materials laminated together. That way the opposite broad faces are distinct from one another at least in the respect that they are different materials. Alternate use of one or the other broad faces of the actuator top for rubbing against a sidewall edge of the box provides at least two different varieties in the characteristic pitch obtained by the material of either. Additionally, a stylus-type scrape call is modified to allow adjustable pitch by the combination of a stylus and an associated damper-handle which has a hole through it in which the stylus is inserted and secured. The damper-handle includes a clamping mechanism to allow its secure connection on the stylus to be relaxed and re-tightened for changing where the stylus is connected thereto, and thus changing the undamped free length of the stylus to become relatively shorter or longer as desired. That way, a user can adjust the pitch of the stylus by changing its undamped length of extension or retraction since generally the pitch goes higher with relative shortening of the undamped free length (and vice versa).
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