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livetrax/scripts/_plugin_modulation.lua

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--- session-script example to modulate plugin parameter(s) globally
--
-- Ardour > Menu > Session > Scripting > Add Lua Script
-- "Add" , select "Modulate Plugin Parameter", click "Add" + OK.
--
-----------------------------------------------------------------------------
-- This script currently assumes you have a track named "Audio"
-- which as a plugin at the top, where the first parameter has a range > 200
-- e.g. "No Delay Line"
--
-- edit below..
-- plugin descriptor
ardour {
["type"] = "session",
name = "Modulate Plugin Parameter",
license = "MIT",
author = "Ardour Lua Task Force",
description = [[An example session to modulate a plugin parameter.]]
}
function factory () -- generate a new script instance
local count = 0 -- script-instance "global" variable
-- the "run" function called at the beginning of every process cycle
return function (n_samples)
count = (count + 1) % 200; -- count process cycles
local tri = math.abs (100 - count) -- triangle wave 0..100
-- get the track named "Audio"
-- see also http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Session
-- and http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Route
local route = Session:route_by_name ("Audio")
assert (not route:isnil ()) -- make sure it exists
-- the 1st plugin (from top) on that track, ardour starts counting at zero
-- see also http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Processor
local plugin = route:nth_plugin (0)
assert (not plugin:isnil ()) -- make sure it exists
-- modulate the plugin's first parameter (0) from 200 .. 300
ARDOUR.LuaAPI.set_processor_param (plugin, 0, 200.0 + tri)
end
end