What is the MTA? I did find the SAMT - Swiss Associationn of Market Technicians, thanks. You may PM me if you like.
https://cmtassociation.org/ try www.meetup.com I found a very good value investing group in London through Meetup.
I cannot speak from experience, as 2019 has been my first year of trading, but here is what Moneyland says about the subject: If the above criteria do not apply to you, I am guessing you could have a rough idea of what taxation would be like by using this tax rate schedule: https://www.ge.ch/document/baremes-2019-perception-impot-source