Click the instrument name, to modify the volume... reverb and panning (mixer properties)

image attached, with details on the image

To change the volume of an instrument, it should be selected from the mixer, then will be able to change the volume and other features.

There is an easier way when having a number of instruments, the user won't need to find the instrument in the mixer to change the instrument's properties, the instrument name, when clicked will function as a hyperlink to open the volume, reverb and other features as required, if that could be tailored.