12-Second Cycle 

1234567891011121234567
8910111212345678910111212
3456789101112123456789
1011121234567891011121234
567891011121234567891011
12123456789101112123456
7891011121234567891011121
2345678910111212345678
9101112123456789101112123
45678910111212345678910
111212345678910111212345
6789101112123456789101112

Press   to restart the sequence.
The above matrix is composed of repeated rows of 12 LEDs which flash periodically at regular intervals. Suppose LED 1 flashes precisely once every second, LED 2 every two seconds, and so on up to LED 12 which flashes every 12 seconds. 

How long will it take until all the LEDs light simultaneously? Needs MIDI support for music.

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