Audio/MIDI multitrack recording software
MultitrackStudio
Manual : Labels

Labels

The Add Track menu's Label item can be dragged and dropped onto mixer sections. A name can be typed immediately after dropping a label, press Enter when done. Labels can be removed by dragging them to the Garbage Bin in the bottom left corner of the window.

You can for example stick a 'Reverb' label to an Effect Return section.

Effect Return with Reverb label
Effect Return with "Reverb" label