Indication that the soft pedal should be used is the instruction "una corda" or sometimes "due corde", with "tre corde" or sometimes "tutte le corde" cancelling it.
As a result, our factory has soft pedaled our production capacity, because, we have a lot of stock and if they have not been absorbed into the network.
This pedal brings the hammers closer to the strings, decreasing the volume while maintaining a normal tone, functioning just like the soft pedal on an upright piano.