This is a continuation of proposals 2017/1-228, 2017/1-343, 2017/1-553, 2018/3-365, 2019/3-454, 2019/3-65, 2021-5-426, 2022/5-13, 2022/5-413 and 2022/5-617- Spectral modelling of supernovae. The paper presenting the spectral synthesis code JEKYLL was published in Astronomy & Astrophysics late in 2018, and a second paper containing an application to Type IIb SNe and an investigation of the effect of the macroscopic mixing of the SN ejecta was published by Astronomy & Astrophysics 2022.. During the last project (2022/5-617) we have been working with models for a new paper where we further investigate Type IIb SNe and the effects of the macroscopic mixing. This work is finished and a paper will be submitted to Astronomy & Astrophysics next weak. Coming up next is a project together with Evan O'Connor, also at the Department of Astronomy at Stockholm University. In this project O'Connor will run 3-D SN explosion models to be feed into the JEKYLL code. This will help us to further constrain the 3-D properties of the ejecta and its effects on the observed lightcurves and spectra. We expect this to result in a new paper towards the end of 2023. During the last five years, we have presented the JEKYLL code at several conferences, and received much attention for its capability to produce realistic simulations of SN spectra and light-curves. This is reflected in the fact that we have calculated JEKYLL models for several external papers. Modeling with the JEKYLL code is also an important complement to the observational activity of the supernova group in Stockholm.