Comment 8 for bug 1157573

> It can be a rate scratch because we are not that much tied to the track position like waveform scratch.

The main issue we face with rate scratching is sticker drift. The user will notice if the play position drifts from where they started with over time. If you turn a wheel a full revolution then turn it back (no matter the speed) it should be ~exactly where you started in the track otherwise people will say we have drift.