Mixer peaks mode

These flags can be passed to mixer.getTrackPeaks() to control the kind of peaks returned.

import mixer, midi

# Get left channel peaks for channel 5.
mixer.getTrackPeaks(5, midi.PEAK_L)

PEAK_L `module-attribute`

PEAK_L = 0

Return peaks for left channel.

PEAK_R = 1

Return peaks for right channel.

PEAK_LR = 2

Return maximum peak for both left and right channels.

PEAK_LR_INV = 3

Return inverted maximum peak for both left and right channels.

TODO: what is an inverted peak?