There will always be a small amount of latency when using Tonetable. This is due to two factors: 1) There is a small amount of latency introduced by the audio system of the iPad 2) There is a small amount of latency introduced by the touch system itself (for example, if you turn on your iPad, and "scratch" your finger over the "slide to unlock" slider, then you will notice that the slider runs slightly behind where your finger is) One other thing to check is that Tonetable is not causing your scope circles to distort when scratching.
