MK114 light organ-how to keep light on for a period of time

How can i keep the light on, on my MK114?
inserting a square wave tone into a .wav or .mp3 is not a problem.

Is there a frequency range that would give me this behavior?
I don’t see any reference to a frequency range in any documentation.



Sorry, due to the simple and low-cost nature of this kit, a frequency range has not been determined.
Please experiment.