  We consider single field chaotic inflationary models plus a cosine modulation
term, as in axion monodromy models, and augment it by a light scalar field with
similar cosine coupling. We show the power spectrum of curvature perturbations
of this model is dominated by the one-loop contribution to inflaton two-point
function which is enhanced due to resonant interactions. This allows to
disentangle the scale of scalar and tensor perturbations and hence to suppress
the ratio of tensor-to-scalar power spectra and alters the expression of scalar
spectral tilt from the simple chaotic models, thus opening the way to reconcile
chaotic models with convex potential and the Planck data. As in monodromy
inflation models, we also have a cosine modulation in spectral tilt. We mention
that contribution of resonance effects on non-Gaussianty is small and it
remains within the current bounds. Resonant production of light particles
toward the end of inflation may set the stage for a successful reheating model.
