Script to unselect / de-select first note of selected notes / events in midi editor?

[Audio_Birdi]

Hi there,

i came across the following script which selects every 2nd event within a range of already selected notes.

How would I go about creating a script that unselects / deselects only the first note / event of a pre-existing note selection?

Thanks in advance!

// Unselects every second selected event. Notes and CC are handled separately. (original by Veto, this version by spk77 - thanks a lot, guys)
// Uses "MIDI_Enum" -functions

Undo_BeginBlock2(0);
function unselectEverySecondEvent()
(
(take = MIDIEditor_GetTake(MIDIEditor_GetActive())) ? (
allEvents = MIDI_CountEvts(take, noteCount, ccCount, sysExCount);

index = -1;
k = 1;
while ((index = MIDI_EnumSelNotes(take, index)) != -1) (
MIDI_GetNote(take, index, isSelected, isMuted, startPpqPos, endPpqPos, channel, pitch, velocity) ? (
k % 2 == 0 ? (
MIDI_SetNote(take, index, 0, isMuted, startPpqPos, endPpqPos, channel, pitch, velocity);
);
k += 1;
);
);

index = -1;
n = 1;
while ((index = MIDI_EnumSelCC(take, index)) != -1) (
MIDI_GetCC(take, index, isSelected, isMuted, PpqPos, type, channel, CCnr, value) ? (
n % 2 == 0 ? (
MIDI_SetCC(take, index, 0, isMuted, PpqPos, type, channel, CCnr, value);
);
n += 1;
);
);
);
);

unselectEverySecondEvent();
Undo_EndBlock2(0,"Unselect every second note/CC",-1);

[juliansader]

activeTake = reaper.MIDIEditor_GetTake(reaper.MIDIEditor_GetActive())
reaper.MIDI_Sort(activeTake)
selectedNoteIndex = reaper.MIDI_EnumSelNotes(activeTake, -1)
if selectedNoteIndex ~= -1 then reaper.MIDI_SetNote(activeTake, selectedNoteIndex, false, nil, nil, nil, nil, nil, nil, false) end

[Audio_Birdi]

Originally Posted by juliansader

activeTake = reaper.MIDIEditor_GetTake(reaper.MIDIEditor_GetActive())
reaper.MIDI_Sort(activeTake)
selectedNoteIndex = reaper.MIDI_EnumSelNotes(activeTake, -1)
if selectedNoteIndex ~= -1 then reaper.MIDI_SetNote(activeTake, selectedNoteIndex, false, nil, nil, nil, nil, nil, nil, false) end

Thanks so much for creating this! it works splendidly

A quick request if you don't mind, is there a way have the script toggle between unselecting the first note and then re-selecting it again when clicking /activating the script again?

Thanks again Julian!

[juliansader]

The following is a very simple version of a toggle script, and will only work if don't make other changes to the notes and note selection:

activeTake = reaper.MIDIEditor_GetTake(reaper.MIDIEditor_GetActive())
savedIndex = tonumber(reaper.GetExtState("js_Toggle first note", "Index"))
if savedIndex then
    reaper.MIDI_SetNote(activeTake, savedIndex, true, nil, nil, nil, nil, nil, nil, true)
    reaper.DeleteExtState("js_Toggle first note", "Index", true)
    reaper.Undo_OnStateChange_Item(0, "Re-select first selected note", reaper.GetMediaItemTake_Item(activeTake))
else
    reaper.MIDI_Sort(activeTake)
    selectedNoteIndex = reaper.MIDI_EnumSelNotes(activeTake, -1)
    if selectedNoteIndex ~= -1 then 
        reaper.MIDI_SetNote(activeTake, selectedNoteIndex, false, nil, nil, nil, nil, nil, nil, true)
        reaper.SetExtState("js_Toggle first note", "Index", tostring(selectedNoteIndex), false)
    end
    reaper.Undo_OnStateChange_Item(0, "Deselect first selected note", reaper.GetMediaItemTake_Item(activeTake))
end

For more intricate pattern-based selections, you can perhaps also try the script js_Select and deselect MIDI notes by step pattern.