Hi Gabriel,
for "Playing Ensemble Voices" please refer to pages 44/45 of the Tyros5 Owner's Manual.
When you have called up the Ensemble Voice display (via the [ENSEMBLE] Voice category button), you normally select one of the "most recommended" eight Voices (via the display buttons 1 - 8).
For more Ensemble Voices press "PRESET" (display button J) to open the File Selection display for Ensemble Voices.
Note: You will be in the same Ensemble Voice category as before you pressed "PRESET" (e.g. in the "Brass" folder, which contains three pages with Voices).
To go to another Ensemble Voice category, press "UP" once (= upper "8" display button) and then select another category folder (Strings, Woodwind, Choir or Others).
By the way: For "Editing Ensemble Voices" refer to pages 19 - 24 of the Tyros5 Reference Manual. This way you can create your own Ensemble Voice settings.
Best regards,
Chris