Yes… I just “acquired” an iPad through exploiting government handouts… and was disappointed that it won’t even boot until you connect to iTunes. Disappointing, really… you’d think it could be marketed as an alternative to a desktop or notebook computer.
obviously iPad will cost much more than the DIY BLM or sequencer, but this is just the basic concept idea.
Now that depends on how much DIY you go… I agree that some LEDs and cheap switches soldered onto veroboard and buying DIN/DOUT/Core32 modules might be cheaper… but to make anything that looks decent, the 16x16 BLM cost will be close to the cost of a new iPad. Consider 256 “good” switches, and a top panel/frame, and a case, etc.
Not that I’m promoting iPad over a hardware BLM. The iPad can do more than just be a BLM, but it doesn’t have “real” buttons.
In case you’re interested, some examples of “doing more”: