![]() ![]() Since ProtoPie offers a mobile app which can run its prototypes, I was able to load my fully working prototype onto an iPhone and test it with users. In a fully developed app, this shouldn’t be a problem, and I decided it was good enough for a proof of concept prototype. This seems to be a limitation of ProtoPie. Tapping a button in the app starts the loud version playing, tapping it again stops it and starts the quiet version, and tapping it again stops the quiet version.Īnother problem I noticed was that the audio files didn’t loop perfectly - there is a short gap when the file starts over. So to simulate volume control in the prototype, I created two versions of each audio file, one loud and one quiet. I ran into a problem when I discovered that ProtoPie had no ability to control the volume of audio files. After trying a few options on how to indicate the different button states, I figured out how to use a mask to animate the fill of the button with each tap, which provided a clear visual metaphor for the button’s operation. ![]() My solution was to allow simple audio mixing with a tap of the button: one tap to turn on the sound at full volume and keep it looping, a second tap to turn it down to low volume, and another tap to turn it off. In my research, I had seen apps that allowed complicated volume mixing for each individual sound, or others with premixed audio and no customizing possible. I collected audio files from Creative Commons resources like, choosing a sound file for each button in the app. ![]()
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