I was reading up on how to hack a USB-A to B cable so it only transfers data and doesn't deliver power. I tried using a piece of tape to cover the metal Vcc tab on the USB-A connector. It worked, the iPad no longer delivers power to the Mastermind, so when I power off the D.C. power supply, the Mastermind shuts off. However, the cable doesn't transfer the MIDI data either, so I can't change presets from the iPad with Bandhelper.
So then I tried a more direct hack, I found an older USB-A to B cable, sliced open the sheathing and cut the red wire, which is Vcc. Same thing, no power, which is good, but data transfer, which is bad.
From what I read, as long as the USB cable has the two data pins and the ground wire connected, it should transfer data but not power. Is there something about how the Matermind LT is designed that would prevent this from working?
It would be really nice not to have to unplug the USB cable every time.
Thanks