Read what i wroteGot my UD today and when trying to copy amp x to amp y on my iPhone seven it mad both amps the 59 guy with everything set to 0. Also when switching presets it kept wanting to change. There is a bit of latency vs using a USB cable mighty also be due to the fact that since this is a smaller screen it literally has to change screens to display more info.
Bluetooth interfaces don't handle large sysex so it won't work...
It's slower because iPhone is slower, not screen size, or maybe the bt interface is slower. It seems even the ud-bt01 uses usb 1.1 not 2.0 for transfers, so you get nearly the same speed you'd have on the md-bt01...
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