Allow audio input for microphone?

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S key maybe should change to StartStopArm.
An armed track may start automatically at
the end of the current track or at a predefined
fade out time.

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BPM detection.
Implement percentage shift/tempo and adjust
accordingly? Needs more investigation.
(tried but soundtouch code was buggy)

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Colors
Dialog deepest: RGB(26, 26, 26)
Dialog deep: RGB(31, 31, 31)
Dialog border: RGB(34, 34, 34)
Dialog bg: RGB(51, 51, 51)
Dialog button: RGB(75, 75, 75)
Dialog button hover: RGB(95, 95, 95)
Dialog button letter on grey bg: RGB(210, 210, 210)
Dialog button letter on blue bg: RGB(224, 224, 224)
Blue control: RGB(55, 141, 247)
Yellow control: RGB(255, 177, 8)
Green control: RGB(85, 137, 36)
Purple control: RGB(161, 60, 213)
Green vu meter: RGB(0, 75, 0)
Yellow vu meter: RGB(79, 79, 0)

