Method and system embodiments of the present invention control the ascorbate concentration in produce treatments and particularly are exemplified in fresh cut fruit and vegetable treatments via measured refractivity andor electrical conductivity of, andor calcium ions present in, the treatment solution. If the operating knob is slid in another direction, MP3 data reproduction is selected and reproduction processing of digital audio data stored in a hard disk is executed in accordance with a play list. An atomization gas is also fed into the pressurization chamber to mix with the liquid precursor liquid stream which breaks into droplets. Between the head pipe side and the steering shaft side there is interposed a steering damper device for restricting abrupt run-out of the handlebar.