The Jawbone does have its own volume control. For info, see the user manual, pages 14-15. (If you lost your copy, you can download one at:
Introducing the brand new Jawbone Bluetooth headset ) From the manual:
Adjusting the Volume
Jawbone will adjust the volume accordingly depending on your noise environment. If you feel that Jawbone is either too loud or too faint, you can adjust the volume of your call in two different ways:
1. Press the volume keys on your mobile phone to increase or decrease the volume.
2. Press the ‘NOISE SHIELD BUTTON’ one time to increase the volume by one level. Jawbone has a total of six volume levels. By pressing the ‘NOISE SHIELD BUTTON’ again, you will advance through these volume levels and hear a 2-step tone. Each successive volume level is identified by a corresponding pitch increase in the second tone. After reaching the maximum volume, you will hear two tones of the same pitch. Once you reach the maximum volume level, if you press the ‘NOISE SHIELD BUTTON’ again, Jawbone will return to the lowest volume level.
I made the adjustment to the loudest setting and am happy with the results. Try it!