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-- Trackpad input by Paul Hedderly
-- Expects two inputs - one master and one slave
-- The first is to track a contolled input for example a
-- sound desk fader.
-- The slave is for a fader on a non-motorised surface...
-- The idea is that the slave is not forwarded to the
-- first/main output until it is close in value to the master
-- This is to avoid sudden jumps when using a secondary
-- non-motorised controller.
--
-- Example config - here using a nanok as a slave to an X32
--
-- [midi x32]
-- read = X32Live
-- write = X32Live
--
-- [midi nanoK]
-- read = nanoKEY
-- write = nanoKEY
--
-- [lua latch]
-- script = latch.lua
-- default-handler = latch
--
-- x32.ch0.cc1 > latch.0.master
-- nanoK.ch0.cc1 > latch.0.slave
-- latch.0.latched > x32.ch0.cc1
threshold=0.03
saved={}
function latch(v)
i=input_channel(); separator=i:find("%.")
channel=i:sub(0,separator-1)
control=i:sub(1+separator,-1)
-- Setup the saved value if not yet seen
if saved[channel]==nil then
saved[channel]=v
end
if control == "master" then
saved[channel]=v
elseif control == "slave" then
diff=math.abs(v-saved[channel])
if diff < threshold then
saved[channel]=v
output(channel..".latched",v)
end
end
end
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