I'm not sure if there is a remote app for this speaker switch, but check out the Aton DLA2 with an RF remote. I have the DLA 4 with RF remote to change volume, mute and on/off multiple pairs of outdoor speakers individually. A little pricey, but works great.
My outdoor set-up summary: Using zone 2 out of my Onkyo to a Onkyo 2ch amp to the DLA4 speaker switch. There are 3 pair of Boston Acoustic Voyager 6 speakers connected to the DLA4. (1 pair over garage for basketball, 1 pair over upper deck and 1 pair under deck over patio area). The amp powers the 3 pair adequately.
My set up
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