  Strong coupling of molecular vibrations to an infrared cavity mode affects
their nature by creating dressed polariton states. We show how the single and
double vibrational polariton manifolds may be controlled by varying the cavity
coupling strength, and probed by a time domain 2DIR technique, Double Quantum
Coherence (DQC). Applications are made to the amide-I ($CO$) and amide-II
($CN$) bond vibrations of $N-methylacetamide$ (NMA).
