As a matter of fact, some say it’s best lo leave it on all the time, as the ‘best’ sound is (reportedly) only achieved after some hours after turning the unit on.
As for me, I am a bit more eco-friendly and prefer to turn it off (via the wired trigger) every time. To the touch, the surface of the St-10 is warm (not hot) even when not playing music. That means electricity is being transformed into heat and consuming unused resources.
I do not notice a huge improvement in sound from the moment I turn it on until the sound achieved a few hours later,
at least nothing that will merit leaving it on.