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- Later on, Wizards &co. came out with the Subsonics feat (Song &Silence, re-printed in Complete Adventurer) which allows only your allies to hear your songs. 后来，威士蛭公司又推出了次声专长（出自歌声和静寂，在完美冒险者中重印），允许你只让队又听到你的歌声。
- 0% increment was achieved in 36 hrs activation by 5 hrs treatment of 17 Hz, 124db infrasonics ( tab. 1 ). 以124分贝;17赫的次声处理5小时;在活化时间为36小时的增加率达32.;0%25。
- infrasonics 次声学
- subsonics 亚音速
