Once you have set up all of your A1-MRs on your Wi-Fi network:
Open the Audioengine control app. Swipe from right to left in the app to the "Device" screen where your A1-MRs are listed. Determine which of the A1-MRs you want to be your primary, then touch and drag (one at a time) any additional A1-MRs you want to add into the primary A1-MR and release to create a custom grouping. You can add multiple A1-MRs into that primary A1-MR for whole-home playback. You can also create multiple custom groupings by dragging available A1-MRs into one another. If you want to undo the grouping, simply touch and hold down the A1-MR you want to remove from the zone, drag out of its current grouping, and release.
Open the Audioengine control app. Swipe from right to left in the app to the "Device" screen where your A1-MRs are listed. Determine which of the A1-MRs you want to be your primary, then touch and drag (one at a time) any additional A1-MRs you want to add into the primary A1-MR and release to create a custom grouping. You can add multiple A1-MRs into that primary A1-MR for whole-home playback. You can also create multiple custom groupings by dragging available A1-MRs into one another. If you want to undo the grouping, simply touch and hold down the A1-MR you want to remove from the zone, drag out of its current grouping, and release.