The T is silent, just like Tsar(zar). A similar example is the name Tepes(Zee-pesh).
In any case I believe the correct pronunciation is "Zeen-CH". "Tch" makes the sound "CH", regardless of which word its used in.
In any case I believe the correct pronunciation is "Zeen-CH". "Tch" makes the sound "CH", regardless of which word its used in.