Just like there are games available to play, we could use a few offline synths or sound effects apps that allow you to press a random generator button and hear a sound generated on the spot, then choose whether to keep it or discard. of course it wouldnt need to be only ‘random’, there might even be a few freeware synths out there that would fit the bill!
more standalone functionality, more variety of sound
using a computer and juggling the sd card back and forth
the ensoniq asr-x pro had an offline drum synth called stomper included so you could synthesize drums and tones that could then be used as samples.
one upload utility for the volca sample that runs on ipad includes a ‘sound fx’ synth with a random button and you can get a ton of good sounds just by tapping next until you hear something you like. at the very least, it would keep users eyes on your device and we get to push clicky buttons more often! bonus!