I haven't studied v2's differences in depth, but in v1 I made a few customizations to add timers, chained cross fades, smooth muting, and perceptual volume control (i.e. takes into account the logarithmic response of hearing).
Anyways, thanks Howler team, you made one of my projects much easier to do!
EDIT: Removed an inaccuracy, it's been a while since I looked at the code.
maybe its company policy:
new Audio() gives Permission denied
It also confused me, they should probably have done something in 2D instead.