A method of scanning at least first and second documents comprising repeating, for each document, the steps of: obtaining the document that is to be scanned, leading edge first, from an input tray; transporting the document by means of a document transport apparatus at a transport velocity past a scanner to obtain image data therefrom, the document transport apparatus being driven by a first motor; and stacking each scanned document in the order of scanning and aligned with trailing-edge registration in a sloped output tray which comprises a first sloped portion and a second sloped portion that guide the trailing edge of the scanned document in a backward direction into alignment against a tapered back wall, wherein the first sloped portion of the output tray nearest the tapered back wall is disposed at a first angle (θ1) relative to the horizontal and wherein the second sloped portion extends outward from the first sloped portion and is disposed at a second angle (θ2) from the horizontal, wherein the first angle (θ1) is steeper than the second angle (θ2), by a sequence that comprises: detecting the trailing edge of the first scanned document; feeding the leading edge of the first scanned document by means of an exit nip transport, which is driven by a second motor at the transport velocity, from an exit nip in a forward direction and above the sloped output tray at the transport velocity; changing the speed of the exit nip transport from the transport velocity to an exit velocity, different from the transport velocity, while the scanned document is within the exit nip, according to the timing of the trailing edge detection; ejecting the trailing edge of the scanned document from the exit nip at the exit velocity; and restoring the speed of the exit nip transport to the transport velocity for feeding the leading edge of the subsequent second document from the exit nip at the transport velocity. obtaining the document that is to be scanned, leading edge first, from an input tray; transporting the document by means of a document transport apparatus at a transport velocity past a scanner to obtain image data therefrom, the document transport apparatus being driven by a first motor; and stacking each scanned document in the order of scanning and aligned with trailing-edge registration in a sloped output tray which comprises a first sloped portion and a second sloped portion that guide the trailing edge of the scanned document in a backward direction into alignment against a tapered back wall, wherein the first sloped portion of the output tray nearest the tapered back wall is disposed at a first angle (θ1) relative to the horizontal and wherein the second sloped portion extends outward from the first sloped portion and is disposed at a second angle (θ2) from the horizontal, wherein the first angle (θ1) is steeper than the second angle (θ2), by a sequence that comprises: detecting the trailing edge of the first scanned document; feeding the leading edge of the first scanned document by means of an exit nip transport, which is driven by a second motor at the transport velocity, from an exit nip in a forward direction and above the sloped output tray at the transport velocity; changing the speed of the exit nip transport from the transport velocity to an exit velocity, different from the transport velocity, while the scanned document is within the exit nip, according to the timing of the trailing edge detection; ejecting the trailing edge of the scanned document from the exit nip at the exit velocity; and restoring the speed of the exit nip transport to the transport velocity for feeding the leading edge of the subsequent second document from the exit nip at the transport velocity. detecting the trailing edge of the first scanned document; feeding the leading edge of the first scanned document by means of an exit nip transport, which is driven by a second motor at the transport velocity, from an exit nip in a forward direction and above the sloped output tray at the transport velocity; changing the speed of the exit nip transport from the transport velocity to an exit velocity, different from the transport velocity, while the scanned document is within the exit nip, according to the timing of the trailing edge detection; ejecting the trailing edge of the scanned document from the exit nip at the exit velocity; and restoring the speed of the exit nip transport to the transport velocity for feeding the leading edge of the subsequent second document from the exit nip at the transport velocity.