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The SwissFEL Aramis Undulator line will produce SASE photon pulses covering a wavelength range from 0.07 nm to 0.7 nm. The facility will consists of an S-band RF-gun and booster, an X-band lineariser, and a C-band main linac, which accelerates the beam up to 5.8 GeV. Two compression chicanes at about 330 MeV and 2.1 GeV will provide a nominal peak current up to 3 kA. It is foreseen to deliver electron pulses between 3 and 19 fs length to the undulator. This is done by adjusting the charge between 10 and 200 pC. Longitudinal wakes in the C-band linac are used to remove the chirp to deliver small bandwidth radiation. A special mode uses these wakes to increase the energy chirp to deliver a photon bandwidth an the percent level for special applications like single shot spectroscopy. In addition a fully compressed 10 pC beam is used as a source of sub femto-second pulses. An iterative semi-analytic procedure was used to setup and optimise the setup efficiently. In this paper these optimised operation modes are presented and discussed.
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