Any individual Drum or Percussion sound can be placed in any Kit, on any Key between C0 and C6.

Drum Kits are limited to the 73 Keys C0 through C6 (where middle “C” = C3

You don’t mention whether you have a 61, 76, or 88 keyboard.

We’ll assume you have MODX6... in which case you can simply assign the Triangle to C6

Just FYI: the Triangle is typically represented in all standard Drum Kit Parts, and is one of the percussion sounds that occupies two Keys... one rings the Triangle A4, the other stops the Triangle from ringing... G#4, using the “Alternate Group” parameter setting... any sounds in the same Group will prevent all other sounds in the Group from sounding... this is how the Closed Hihat, and Pedal Hihat, stop the Open Hihat (all 3 are in the same Alternate Group).

Call up the Orchestral Kit or your Performance that includes the Kit.
Select the Part
Press [EDIT] > tap “Osc/Tune”
On a Drum Kit you’ll see the Note/Key selection functions in the lower right corner.
Activate the Keyboard Select (green) and touch the Key recalling A4 the Triangle
Hold [SHIFT] + [EDIT]
Select “Exchange” (green)
The dialog box will allow you to swap the the data on A4 with any other KEY in this Part, set it to target C6
Execute.

If you have MODX7 or MODX8 you’ll need an entirely different tactic... you can place the Triangle Element on the very highest Key, but you will need to create a new Normal AWM2 Part and set the Oscillator so it is assigned to just that Key.

Thank you as always. Worked great.

I have a MODX8. Can you please explain that last sentence in your post about Normal AWM2?
I'd still prefer to place the sound on a key higher than C6, even though the method you outlined works fine.

It's the intro for "Under the Boardwalk." 🙂

AWM2 uses sampled sounds. There are two different "presentations" of AWM2. One is "normal" - what your standard non-drum-kit sounds are (sampled pianos, sampled guitars, sampled basses, sampled strings, sampled synths, etc ...) and the other is "drum". A drum kit is different than "normal" in more respects than I'll explain here - but one key difference for this discussion is that drums only occupy 73 of the total 88 piano physical keys or total 128 maximum MIDI notes.

For reference, from the reference manual:

Internally, there are three Part types: Normal Parts (AWM2), Normal Parts (FM-X), and Drum Parts. Normal
Parts (AWM2) are mainly pitched musical instrument type sounds that can be played over the full range of
the keyboard. Normal Parts (FM-X) are also mainly pitched musical instrument type sounds, using FM
synthesis. Drum Parts are mainly percussion/drum sounds that are assigned to individual notes. A Normal
Part (AWM2) can consist of up to eight Elements, a Normal Part (FM-X) can consist of up to eight
Operators, and a Drum Part can consist of up to 73 Drum Keys.

... and later:

Each Drum Part can consist of up to 73 Drum Keys, assigned to notes spread across the keyboard (C0 to C6)

Therefore, if you use drum keys C0-C6 then the general case is that drum keys will never reach the top keys of most keyboards without using the "Octave" offset button or similar. The top note of a MODX8 without octave shifting is a C7. One octave higher than the range of the Drum Part. Instead, you would need to find another way to make the highest piano key play the sample associated with a triangle. For this, use AWM2 (Normal).

When building custom Performances, it's sometimes helpful to build from the ground up. For this, use the Initialized Performances:

"Init Normal (AWM2) " for normal AWM2 based Performances (or building Parts)
"Init Drum" for drum based Performances (or building Parts)

Although a triangle would naturally belong in a drum kit (Init Drum) - the need/desire to have it on the top key of your MODX may drive using a normal AWM2 Part instead (and possibly start with "Init Normal (AWM2) " ).

Correct. A Normal AWM2 is a musical instrument that can play scales across a range of notes.
A Drum AWM2 has a different musical instrument on each Key (C0-C6)

Background: a drum kit (invented back in the early part of the last century) was originally referred to by jazz musicians as a “Trap” Kit (short for “contraption”... a jazz musician somewhere welded a Tom mount, fashioned a kick pedal, hung a cymbal somewhere... everyone referred to it as a contraption.

There are ‘normal’ musicians, and then there are drummers! (There are a million jokes...). But percussionists are generally specialist, so a Drum Kit of samples mainly has a different instrument on each and every Key. Each Key has its own Volume, a separate Pan position, a separate Envelope Generators, its own filters, its own Routing to the outputs, etc... per Key. If you are in a marching band, you have a person who plays just the Bass Drum, a different set of players have a single snare drum, still others just play just the crash cymbal... etc.

Exception: Some drum/percussion sounds occupy several Keys (Hihats, Triangle, Guiro, Cuica, etc), but mostly the KIT concept is to give each drum/percussion instrument autonomy... Kits are very complex entities... and are restricted to 73 Keys. 6 octaves.

Solution: Building a Triangle Element in a Normal AWM2
Initialize a Normal AWM2 Performance
Press [CATEGORY]
Set “Bank Favorite” = All
Set the “Attribute” = All
Tap “Init” > select “Init Normal AWM2”

From the HOME screen
Tap “Type/Name” box for Part 1 in the screen to see the pop-in menu.
Tap “Edit”
Along the bottom of the screen tap “Elem1” > “Osc/Tune”
You can now use the Search engine to find your Waveform

The default is an Init acoustic piano - tap the Waveform Name box to see the pop-in menu
Tap “Category Search”
You now will see, in amber, the Waveform search results field

You can type in Triangle... or
You can tap Drum/Perc
There’s even a way to enter a “Number” Waveform 2883 = Triangle1 Open

It will now play pitched across all keys. It is a “normal” instrument now...
You’ll need to tweak the AEG — tap “Amplitude” > “EG”
(If you need help here let us know... hint make sure you set DECAY2 LEVEL = 0

Use middle “C” as a reference... for tuning — in other words, you want the pitch you would like to use to sound from middle “C”
In the lower right corner of screen you can set how this Element plays across the Keyboard.

The default is 100% which applies (in this case) Equal Temperament
Set the “Pitch/Key” = 0% (no change across the range) The Pitch you heard from middle “C” is now across all keys.

Set the Element Low Note Limit = C7 which is the highest Key on your 88-note keyboard. This now becomes the lowest Note that will sound the Triangle.

Once you have created this Element, you can add it to any Part you desire — provided it has an available Element slot — using the “COPY - Element” routine; simply use the Note Limits to ensure that only the Triangle Element sounds when C7 is engaged.

Copy Element
If you have an available Element within an existing Part, you can place your new creation in the same Performance. Once your new Part and the others you are playing are in the same Performance — you can consolidate this Element into an existing Part.

The COPY - Element routine allows you Copy an Element from one Part to another as long as the two Parts are within the same Performance
Select the Element you wish to COPY (your new created Triangle)
Press [SHIFT] + [EDIT]
Set COPY (green)
The left items are the source (they populate automatically to the current selection) ... the items on the right are the target.

Once you have copied the Elements so they are in the same Part... you can use Element Note Limits to prevent any Element other than the Triangle1 Open from sounding from note C7

Delete the Part you copied from by tapping the Type/Name box for that Part, and selecting DELETE from the pop-in menu.

Hope that helps.

Followed your procedure. AWESOME!
Thanks so much, guys!