Hope this is what you mean ...

Under the [UTILITY] menu there's a screen that shows documentation on the [SHIFT] button functions. The owner's manual does too. Page 55 of "montage_en_om_b0.pdf".

From the manual:

[SHIFT] + KNOB POSITION [1] Stores Assign 1 – 8 assigned to Knobs in Value 1.
[SHIFT] + KNOB POSITION [2] Stores Assign 1 – 8 assigned to Knobs in Value 2.
[SHIFT] + OCTAVE [-] Decreases the transpose value by 1.
[SHIFT] + OCTAVE [+] Increases the transpose value by 1.
[SHIFT] + OCTAVE [-] + OCTAVE [+] Resets the transpose value to 0.
[SHIFT] + [DEC/NO] Decreases the selected parameter value by 10.
[SHIFT] + [INC/YES] Increases the selected parameter value by 10.
[SHIFT] + [ENTER] Calls up the Tempo Setting display.
[SHIFT] + [PERFORMANCE] Calls up the Overview display.
[SHIFT] + [LIVE SET] Calls up the Live Set Register display.
[SHIFT] + [UTILITY] Calls up the Quick Setup display.
[SHIFT] + [CATEGORY SEARCH] Calls up the Part Category Search display for the currently selected Part.
[SHIFT] + [PERFORMANCE CONTROL] Sets for Performance Control. Selects Part 9 if any Part other than Part 9 has been
selected.
[SHIFT] + SCENE [1] – [8] Stores SCENE 1 – 8 in SCENE [1] – [8] buttons.
[SHIFT] + Number A [1] Selects the 1st row and the 1st column of the left tab.
[SHIFT] + Number A [2] Selects the 1st row and the 2nd column of the left tab.
[SHIFT] + Number A [3] Selects the 1st row and the 3rd column of the left tab.
[SHIFT] + Number A [4] Selects the 1st row and the 4th column of the left tab.
[SHIFT] + Number A [5] Selects the 1st row and the 5th column of the left tab.
[SHIFT] + Number A [6] Selects the 1st row and the 6th column of the left tab.
[SHIFT] + Number A [9] Selects the 2nd row and the 1st column of the left tab.
[SHIFT] + Number A [10] Selects the 2nd row and the 2nd column of the left tab.
[SHIFT] + Number A [11] Selects the 2nd row and the 3rd column of the left tab.
[SHIFT] + Number A [12] Selects the 2nd row and the 4th column of the left tab.
[SHIFT] + Number A [13] Selects the 2nd row and the 5th column of the left tab.
[SHIFT] + Number A [14] Selects the 2nd row and the 6th column of the left tab.
[UTILITY] + [PART COMMON] Calls up the Touch Panel Calibration Setting display.

The Number A [1]-[16] buttons are the grid of buttons on the far-right of Montage that are labeled as "PART SELECT 1-16" in the upper-right corner of this cluster or "PART SELECT" and "PART MUTE" on the left-hand side.

Here's an image of the general area:

There we go! That's exactly what I needed. Thanks!