so ..
mute solo
knobs send to different fx busses
and a switchable (*) recarm for muting tracksends, muting fx on tracks or muting items on tracks, or switch the lane betwenn one and two if there are more than one on a track
you what you want

Version 1 : mutes the fourth send on the track

Version 2 : mutes a fx on a track (configered in the script it self in department version 2)

Version 3 : mutes the items on the track

Version 4 : switch the first two track lanes if there are more than one

in the toolbar 1 there is a button 'Vers' that calls a switcher script

the REAPER_DUB_ALL_IN_4.ReaperConfigZip (1) contains an eight track project (a big one (*), be patient while downloading) that uses option 4
the 4.ReaperConfigZip (2) contains an eight track project (a big one (*), be patient while downloading) that uses option 4, this one lights the recarmbuttons
the 4 realearn.ReaperConfigZip (3) thing contains an attempt to accomplish the whole thing with REALEARN from helgoboss. (there is something missing here)

create portable or parallel installation and import the config. i explain it here

load one of the two project templates and have fun
(*) the track included are from here
AND !! the "Media buffer size" in the Preferences are set to 256 instead of the standard 1200 . higher values will cause remarkable delay when switching the lanes while playing. (1) created under windows, there are some corrections to make when loading on other os
(2) created under linux, there are some corrections to make made when loading on other os
(3) created under windows, there are some corrections to make when loading on other os
read above before downloading anything