mister happy
It appears that the FabFilter Q2 equalizer plugin has an interchange for control of 24 different bands. In the plugin GUI the bands are not named with a displayed number but in the SONAR dialog (and I suspect behind the scenes in the plugin) the bands are numbered 1 through 24.
Bands are assigned the first available number. The band number is shown in the upper right area of the band control. The image below shows band #2 in the control.

For more information about band assignment, see the band controls section in the Pro-Q 2 help.