Volume for individual speakers when playing as a group

hi All, 

When all my speakers are playing the same playlist, I may need to adjust the volume of the playback in one of the rooms. Noticed that when I use the physical control on the speaker to turn up or down the volume, the volume is modified on ALL speakers. This is frustrating, as in some rooms the volume is fine and does not need adjusting.  

Is there a way to adjust the volume on individual speakers without impacting speakers in other rooms when they all play from the same playlist? Any suggestions will be greatly appreciated!  Kenny