Have you tried performing using an android app? I used a drum-pad app the other week and the latency makes it unplayable.
There's a great explanation here as to why it's so bad: http://superpowered.com/androidaudiopathlatency
There's a great explanation here as to why it's so bad: http://superpowered.com/androidaudiopathlatency
There are also indications that they are going to lower the display path latency, which also stands several times higher than what is in iDevices. It just takes some time to get a certain class of software architects to realize that buffering a frame several times each step might not be the smartest way after all.