  We revisit the flavor symmetries arising from compactifications on tori with
magnetic background fluxes. Using Euler's Theorem, we derive closed form
analytic expressions for the Yukawa couplings that are valid for arbitrary flux
parameters. We discuss the modular transformations for even and odd units of
magnetic flux, M, and show that they give rise to finite metaplectic groups the
order of which is determined by the least common multiple of the number of
zero-mode flavors involved. Unlike in models in which modular flavor symmetries
are postulated, in this approach they derive from an underlying torus. This
allows us to retain control over parameters, such as those governing the
kinetic terms, that are free in the bottom-up approach, thus leading to an
increased predictivity. In addition, the geometric picture allows us to
understand the relative suppression of Yukawa couplings from their localization
properties in the compact space. We also comment on the role supersymmetry
plays in these constructions, and outline a path towards non-supersymmetric
models with modular flavor symmetries.
