  Understanding the modification of jets and high-$p_T$ probes in small systems
requires the integration of soft and hard physics. We present recent
developments in extending the JETSCAPE framework to build an event generator,
which includes correlations between soft and hard partons, to study jet
observables in small systems. The multi-scale physics of the collision is
separated into different stages. Hard scatterings are first sampled at binary
collision positions provided by the Glauber geometry. They are then propagated
backward in space-time following an initial-state shower to obtain the
initiating partons' energies and momenta before the collision. These energies
and momenta are then subtracted from the incoming colliding nucleons for
soft-particle production, modeled by the 3D-Glauber + hydrodynamics + hadronic
transport framework. This new hybrid approach (X-SCAPE) includes non-trivial
correlations between jet and soft particle productions in small systems. We
calibrate this framework with the final state hadrons' $p_T$-spectra from low
to high $p_T$ in $p$-$p$, and and then compare with the spectra in $p$-$Pb$
collisions from the LHC. We also present results for additional observables
such as the distributions of event activity as a function of the hardest jet
$p_T$ in forward and mid-rapidity for both $p$-$p$ and $p$-$Pb$ collisions.
