| 摘要 |
An apparatus ( 12 ) which overcomes the foregoing inconveniences of manually adjusting the audio device ( 10 ) volume related to a vessels speed and participants distance behind the vessel in a towable activity. This apparatus ( 12 ) controls audio volume levels ( 14 ) set at V 2 and ( 16 ) set at V 1 where V 2 is greater than V 1 and audio volume level ( 14 ) is achieved when vessels engine or propulsion shaft RPM is above set point ( 22 ) for a time greater than designated by ( 24 ), thereby controlling audio volume as a relation to vessel speed.
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