  We introduce two new features to REBOUNDx, an extended library for the N-body
integrator REBOUND. The first is a convenient parameter interpolator for
coupling different physics and integrators using numerical splitting schemes.
The second implements a constant time lag model for tides (without evolving
spins) from Hut (1981). We demonstrate various examples of these features using
post-main sequence stellar evolution data from MESA (Modules for Experiments in
Stellar Astrophysics). These additional effects are publicly available as of
REBOUNDx's latest release.
