  We compute the quasi-normal frequencies of scalars in asymptotically-flat
microstate geometries that have the same charge as a D1-D5-P black hole, but
whose long BTZ-like throat ends in a smooth cap. In general the wave equation
is not separable, but we find a class of geometries in which the non-separable
term is negligible and we can compute the quasi-normal frequencies using WKB
methods. We argue that our results are a universal property of all microstate
geometries with deeply-capped BTZ throats. These throats generate large
redshifts, which lead to exceptionally-low-energy states with extremely long
decay times, set by the central charge of the dual CFT to the power of twice
the dimension of the operator dual to the mode. While these decay times are
extremely long, we also argue that the energy decay is bounded, at large $t$,
by $(log~t)^{-2}$ and is comparable with the behavior of ultracompact stars, as
one should expect for microstate geometries.
