  We present inelastic neutron scattering experiments on the $S=1/2$ frustrated
gapped quantum magnet piperazinium hexachlorodicuprate under applied
hydrostatic pressure. These results show that at 9 kbar the magnetic triplet
excitations in the system are gapless, contrary to what was previously
reported. We show that the changes in the excitation spectrum can be primarily
attributed to the change in a single exchange pathway.
