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Changing Led Colors On Vu Meter Kit - Help

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OK I picked up this kit for like 20 bucks. Got it together and working with LEDs included. However I want to swap to all blue LEDs. The blue LEDs use 3.2 volts but the green only take 2.2 volts. Anyone think I can make a small change and up the volts enough to power a blue led? Here are pics.

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#9  

Hmm well a servo is still pwm in itself. I'm not sure how I can finagle this. I will try to "raise" voltage first. My meter is auto ranging and the pulse is to brief to accurately measure. Worse case I should be able to use the led output to trigger a switching transistor. Do ya think 2.2 volts is enough to trigger one?

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