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Since this achievement is only available after you have played through the game once, during the first play through only the initial radio exists and its blue light and signal will not change if brought to its achievement location. The achievement for an individual radio persists across saved games, though the light will change back to red. The music will change to static as you approach the correct location, and then to a hidden signal when you have arrived, at which point the light will turn green. A radio will have a red light on the front if it hasn't been brought to the correct location.
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The newest achievement, added in Mato Steam only, requires the player to find one (or more in some of the larger stages) radio(s) in each level and bring each to a specific point. Completing a chamber or chapter does not enable the radios to be available.
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