Hi all, This is actually quite a long-time issue as far as I am aware of. My card is Xonar Essence STX. There is no problem when I change the volume in alsamixer. The problem occurs when I bind XF86Audio{Raise,Lower}Volume (a volume wheel on my keyboard) to amixer commands. Volumes of the two channel can easily de-sync from each other as long as I roll the wheel (up or down) fast. The problem doesn't occur if the commands target volume control of a onboard or USB sound card (even while their control allows different volumes for the two channels). Regards, Tom