Lua - Setting all session faders to a specific value

serdeman · April 9, 2020, 2:01am

Greetings Ardour friends,
I’m trying my hand at writing a Lua script that will set all session faders to a certain value. Looking at the Lua section in the Ardour manual, I can’t seem to find “how” to actually set a fader value. Any guidance would be much appreciated.

Thank you,
Steve

x42 · April 9, 2020, 2:23am

The Fader is the main gain_control of each Track. So to set all faders to -6dB (gain coefficient 0.5):

for t in Session:get_tracks():iter() do
    t:gain_control():set_value (0.5, PBD.GroupControlDisposition.NoGroup)
end

I suggest to look at examples. The following two seem pertinent:

github.com

Ardour/ardour/blob/master/share/scripts/faders_to_trims.lua

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

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github.com

Ardour/ardour/blob/master/share/scripts/s_fader_automation.lua

ardour { ["type"] = "Snippet", name = "Fader Automation" }

function factory () return function ()
	local playhead = Session:transport_sample ()
	local samplerate = Session:nominal_sample_rate ()

	-- get selected tracks
	rl = Editor:get_selection ().tracks:routelist ()

	-- prepare undo operation
	Session:begin_reversible_command ("Fancy Fade Out")
	local add_undo = false -- keep track if something has changed

	-- iterate over selected tracks
	for r in rl:iter () do
		local ac = r:amp ():gain_control () -- ARDOUR:AutomationControl
		local al = ac:alist () -- ARDOUR:AutomationList (state, high-level)

		-- set automation state to "Touch"
		ac:set_automation_state (ARDOUR.AutoState.Touch)

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serdeman · April 9, 2020, 4:10am

Hi Robin,

Thank you so much for helping me with this. It worked!
And I am so glad there is a quick script access under the Edit menu. Awesome.
Thank you,
Steve

system · July 9, 2020, 10:10am

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