This post documents the addition of an electronic drum sampler within the wireframe app. There is also a time-accelerated screen recording video showing the process and procedure.
The 808 drum samples were sourced for free from here, however, it is unknown if these samples are allowed for commercial use. If the app were to be officially made, samples would have to be purchased if the usage license required it. The samples are currently .wav which didn’t seem to have any problems when running on an iPad 4 (iPad with Retina Display) and above.
See below for the resulting draft screenshot, as well as the process video.