  BlueMUSE is a blue, medium spectral resolution, panoramic integral-field
spectrograph under development for the Very Large Telescope (VLT). We
demonstrate and discuss an early End-To-End simulation software for final
BlueMUSE datacube products. Early access to such simulations is key to a number
of aspects already in the development stage of a new major instrument. We
outline the software design choices, including lessons learned from the MUSE
instrument in operation at the VLT since 2014. The current simulation software
package is utilized to evaluate some of the technical specifications of
BlueMUSE as well as giving assistance in the assessment of certain trade offs
regarding instrument capabilities, e.g., spatial and spectral resolution and
sampling. By providing simulations of the end-user product including realistic
environmental conditions such as sky contamination and seeing, BlueSi can be
used to devise and prepare the science of the instrument by individual research
teams.
