REAPER script: Toggle FX online, bypass, and track lock for selected tracks.

Toggle FX online for selected tracks.lua

-- Version 1.1
--
-- This script toggles FX online/offline, FX bypass, and track lock on
-- all selected tracks.
--
-- SWS cycle actions can be used for toggling only online and lock, but
-- not if you also want to include FX bypass.

-- SWS is required (http://www.sws-extension.org/)
--
-- Released to the public domain.

-- Select (1) or unselect (0) the given tracks.
function setSelected(tracks, selected)
    for i, track in ipairs(tracks) do
        reaper.SetMediaTrackInfo_Value(track, "I_SELECTED", selected)
    end
end

function fixRecordArmBug()
    -- Bug workaround: sometimes, after the FX have loaded, the track does not honor
    -- automatic record arming.  If the track is not record armed, then toggle
    -- selection to force it.
    for trackIdx = 0, reaper.CountSelectedTracks(0) - 1 do
        track = reaper.GetSelectedTrack(0, trackIdx)
        if reaper.GetMediaTrackInfo_Value(track, "I_RECARM") == 0 then
            reaper.SetTrackSelected(track, false)
            reaper.SetTrackSelected(track, true)
        end
    end
end

function main()
    if reaper.NamedCommandLookup('_SWS_TOGSELMASTER') == 0 then
        reaper.ShowMessageBox("Error: script requires the SWS extensions (www.sws-extension.org).",
                              "SWS extension missing", 0)
        return
    end    
    -- Determine which tracks need to be unlocked and brought online.
    -- Any track with FX bypassed qualifies.
    numSelected = reaper.CountSelectedTracks(0)
    needUnlock = {}
    for idx = 0, numSelected - 1 do
        track = reaper.GetSelectedTrack(0, idx)
        if reaper.GetMediaTrackInfo_Value(track, "I_FXEN") <= 0 then
            needUnlock[#needUnlock+1] = track
        end
    end

    reaper.PreventUIRefresh(1)
    reaper.Undo_BeginBlock2(0)
    -- Unlock all tracks initially.
    -- Track: Unlock track controls
    reaper.Main_OnCommandEx(41313, 0, 0)
    -- Track: Toggle all FX online/offline for selected tracks
    reaper.Main_OnCommandEx(reaper.NamedCommandLookup('_S&M_FXOFFALL'), 0, 0)
    -- Track: Toggle FX bypass for selected tracks
    reaper.Main_OnCommandEx(8, 0, 0)
    -- Track: Toggle mute for selected tracks
    reaper.Main_OnCommandEx(6, 0, 0)

    -- Now we need to lock the tracks that have been offlined.  Unfortunately
    -- there is no API for doing this on individual tracks.  The best we can do
    -- is invoke an existing action.  So, here we unselect all tracks that need
    -- to stay unlocked, invoke the "lock track controls" action, and then reselect
    -- the temporarily unselected tracks.
    if #needUnlock < numSelected then
        setSelected(needUnlock, 0)
        -- Track: Lock track controls
        reaper.Main_OnCommandEx(41312, 0, 0)
        setSelected(needUnlock, 1)
    end
    fixRecordArmBug()
    reaper.Undo_EndBlock2(0, "Toggle FX online/bypass/lock for selected tracks", -1)
    reaper.PreventUIRefresh(-1)
end

main()