=> R0 = Channel number (1-4) or 0 for all channels
<= If R0 = 1-4 on entry, then
R0 = VU bar height for the channel specified in R0 (0-64)
If R0 = 0 on entry, then
R0 = word containing 1 byte per channel of all the 4 channels' VU bar heights (0-64, each byte)
This SWI lets you read the current VU levels of the QTM VU bar handler. This call should only be used if the VU bar handler has been enabled using QTM_VUBarControl.
Note: Currently QTM VU bars are only available for channels 1-4.
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