We used a simple 2 channel fader to fade between the two LED strands. The faders are not very powerful, so they tend to lag across the length of the LED strands, since they draw so little power, you can use the faders where normal C7's would blow them after just a couple of strands.
While the lag effect may not be desired, I actually kind of like it... it has a rolling across the roofline effect going for it.
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