In the figure shown, $\mathrm{Sw}$ is a switch whose position changes from 1 to 0 when $\mathrm{Vc}$ changes from logic HIGH to LOW and vice versa. The bandwidth of the permanent magnet moving coil (PMMC) type voltmeter is $1 \mathrm{~Hz}$. If $\mathrm{V}_{\text {sense }}=2 \sin (4000 \pi \mathrm{t}) \mathrm{V}$ and $\mathrm{V}_{\text {ref }}=4 \sin (2000 \pi \mathrm{t}) \mathrm{V}$, the voltmeter reading is $\mathrm{V}$ (rounded off to nearest integer).
Note: Assume all components are ideal.