  Lattice-QCD predicts the exotic meson $\pi_1(1600)$ to dominantly decay to
$b_1\pi$. The $b_1\pi$ decay channel is accessible via the
$\omega\pi^{-}\pi^{0}$ final state. COMPASS recorded the so far largest data
set of this final state. A partial-wave analysis allows to determine the
resonant content in this final state including possible contributions from
$\pi_1(1600)$. Decomposing the measured intensity into amplitudes of partial
waves gives a first qualitative insight into contributing intermediate states.
We observe signals in agreement with well-established states like the
$\pi(1800)$ and $a_4(1970)$. Smaller resonance-like signals are visible in the
$J^{PC}$ sectors $3^{++}$ and $6^{++}$, where possible states were claimed but
none are established. For $J^{PC}=1^{-+}$ a signal at
$1.65\,\mathrm{GeV/}c^{2}$ in $b_1(1235)\pi$ partial waves is consistent with
the expected $\pi_1(1600)$.
