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ardour {
["type"] = "EditorAction",
name = "Faders to Trims",
license = "MIT",
author = "PSmith",
description = [[Add 'Trim' plugins to all tracks. Move the fader value into the trim.]]
}
function action_params ()
return
{
}
end
function factory (params)
return function ()
-- loop over all tracks
for t in Session:get_tracks():iter() do
fader_value = t:gain_control():get_value()
v = math.log(fader_value, 10)
trim_gain = 20*v
fader_pos = 0
local proc;
local i = 0;
repeat
-- find the fader proc
proc = t:nth_processor (i)
if (not proc:isnil() and proc:display_name () == "Fader") then
fader_pos = i
end
i = i + 1
until proc:isnil()
-- apply the trim
trim = t:nth_processor (fader_pos+1)
if (not trim:isnil() and trim:display_name () == "a-Amplifier") then
--existing trim found; sum the trim and the fader gain, and set the trim to that value
cur_gain = ARDOUR.LuaAPI.get_processor_param (trim, 0)
ARDOUR.LuaAPI.set_processor_param (trim, 0, trim_gain+cur_gain)
else
--create a new Trim processor, and set its value to match the fader
local a = ARDOUR.LuaAPI.new_luaproc(Session, "a-Amplifier");
if (not a:isnil()) then
t:add_processor_by_index(a, fader_pos-1, nil, true)
ARDOUR.LuaAPI.set_processor_param (a, 0, trim_gain)
a = nil -- explicitly drop shared-ptr reference
end
end
--zero the fader gain
t:gain_control():set_value(1, PBD.GroupControlDisposition.NoGroup)
end --foreach track
end --function
end --factory
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