Combined MIDI controllers 14-bit

[human fly]

hi everyone,

lazy initial question (passing thought), re: 14-bit MIDI CC protocol.

eg: ‘combined controllers’ – you use two MIDI CC to send your higher resolution message,
as MSB/LSB pair (‘coarse/fine’).

you can have a look at Atom’s Synth Lite2 panel to see how this is implemented in Ctrlr,
as a standard feature of Ctrlr. but i would like to code this in Lua. i’m a bit rusty,
so i’m polling some advice before attacking it.

essentially, the ‘low’/MSB CC will 0-31 ,and the ‘high’/LSB CC will be 32-63 (eg: n + 32 )

i want to make a controller for MFB PolyLite, the ‘multi’/poly version of the SynthLite2,
with a bit of flexibility, rather than relying on the built-in Ctrlr CC handling.

thanks for any thought on this :tu:

[dnaldoog]

You can do that with BigInteger getBitRangeAsInt() method:

To convert a Multi CC message as in:

CC,ByteValue,MSB7bitValue,23,-1
CC,ByteValue,LSB7bitValue,55,-1

In Lua:

--
-- Called when a modulator value changes
-- @mod   http://ctrlr.org/api/class_ctrlr_modulator.htmla
-- @value    new numeric value of the modulator
--
myMultiCC = function(mod,value,source)
local myChannel=panel:getProperty("panelMidiOutputChannelDevice")
local add=0xb0+(myChannel-1)
      local bv=BigInteger(value) --break the value into 4bit nibbles
      local msb=bv:getBitRangeAsInt(7,7) -- position of msb
      local lsb=bv:getBitRangeAsInt(0,7) -- position of lsb
    m = CtrlrMidiMessage({add, 23, msb}) 
    l = CtrlrMidiMessage({add, 55, lsb}) 
    panel:sendMidiMessageNow(m)
    panel:sendMidiMessageNow(l)
end--f

Where 23 and 55 are the MSB/LSB Bank Select control numbers for adsr2Sustain uiSlider [ADSR Sustain] on that panel by Atom.

… or alternatively you could split the value this way:

msb=bit.rshift(value, 7)
lsb=bit.band(value, 127)

Regards,

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