Old-school electrophysiologists like to listen to the ephys signals during experiments. For example, this allows to precisely hear when the patch pipette approaches a target neuron. The technique is discussed in the Axon Guide: “Audio Monitor: Friend or Foe?”.
The following is something very similar: Calcium imaging of neuronal activity (GCaMP6f), and an audio track that is derived from a simultaneously performed cell-attached recording of the same neuron (detected action potentials are convolved with a particular sound event, like two metals hitting each other, the sound of an anvil, and the sound of gunshots – the “firing” neuron).
Three times the same calcium recording, but with different soundtracks: