organ pedal with a control mechanism for channel flaps, pistons for switching on copulas and a sequencer

amplifier antique audio backgrounds black broadcasting business button channel close color communication computer control copulas dirty electrical electronics equipment flaps industry instrument key knob machine machinery macro mechanism media metal mixer music musical object obsolete old oldfashioned organ panel part pedal people piano pistons push radio record recording retro sequencer single sound stereo studio styled switch switching synthesizer technology tool volume white work