no sound in android app

the "pop" sound that plays on button presses and gesture executions has never worked correctly for me in the android app on either of my android devices (droid incredible 2 and kindle fire). in version 1.0.1 it played for button presses, but not when gestures were executed. now in version 1.3 it doesn't play at all. i've double checked to make sure "play sound on tap" is checked in the settings, and that none of my devices volume categories are muted or low.
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