When adding objects to Timers, multi-channel input and output objects will trigger a dialog box asking which channels should be added to the Timer. These composite objects are actually multiple objects, but they’re represented on screen as a single object in order to provide unified and more organized wiring and control panels.
A multi-channel Gain object is not a composite object and does not provide a dialog box to select channels.
If two channels of a composite object are selected in the dialog box, only parameters from those two channels will be added to the Timer. If additional channels from the same composite object need to be added to the Timer later, the additional channels may be added individually or in multiples and will appear in the Timer window as usual.