When connecting 2 amps to an ES-8, different amp configurations are set up on a patch by patch basis.
1. Connect Amp 1 to Out 1/L.
2. Connect Amp 2 to Out 2/R.
3. Press the EDIT button.
4. Press the Left/Right Arrow buttons until you get to the PATCH section.
5. Press ENTER.
6. Press the Left/Right Arrow buttons until you get to the
Output page.
7. Press ENTER.
8. Press the Left/Right Arrow buttons to move the cursor under the
parameter value just to the left of “Sel:”.
9. Using the + and - buttons, choose either the 1, 2, or 1&2
output choices.
10. For the next preset up, do the same procedure for the
second amp, choosing a different amp output selection.