Inspired by the work of Ogilvie and coworkers, here we report on a hybrid implementation that leverages the distinct advantages of the pump-probe and BoxCARS geometries by implementing a pulse shaper within the BoxCARS configuration. In the work of Ogilvie and coworkers, a 2D ES spectrometer with a hybrid diffractive-optic/pulse-shaping approach was introduced to measure background-free spectra in the BoxCARS geometry, however, diffractive optics have significant limitations in the IR due to the large bandwidth of the pulses compared to the center frequencies, which results in severe spatial chirp. Here we report on the design and implementation of a 2D IR setup for rapid acquisition of background-free 2D IR spectra with phase control of the pump pulses using a pulse shaper (Figure ), which we refer to as "Fast-scan BoxCARS". This implementation combines the background-free signals from the BoxCARS geometry with the precise timing and phasing controls afforded by pulse shaping. Adopting a pulse shaper within the BoxCARS geometry allows for shot-to-shot modulation of the pump pulses, complete control of the amplitude and phase of the pump pulses, and simultaneous collection of the rephasing and nonrephasing signals. In general, our new hybrid setup provides an enhancement in SNR as compared to conventional pump-probe setups. The drawback of this setup is that the 2D IR spectra must be phased to obtain purely absorptive lineshapes. The input pulse (red) is split by a beam splitter (BS) into two pulses. One pulse travels through the pulse shaper with an acousto-optic modulator (AOM), then a second BS, resulting in two pairs of pump pulses (E1 and E2, green; E1' and E2', orange) and each pulse pair is separated by t1. The probe line is split into E3 (purple), the tracer (dashed gray line), and the LO (blue) using a CaF2 wedge. t2 is the waiting time between the pump and probe beams. The pump and probe pulses are focused by the parabolic mirror (PM) onto the sample to generate the photon signal. The tracer tracks the direction of the emitted signal and is used as the probe in pump-probe measurements, and the LO heterodynes with the photon echo on another BS to recover the signal amplitude and phase. All beam splitters are 50/50 dielectric beam splitters on a ZnSe substrate, and the wedges are uncoated 3° CaF2.