I was mixing down some multitracks recorded from a band for testing purposes,
and then remembered that in PyDAWv4 I removed the ability to start playback
in mid-audio item (mostly due to some fundamental changes I was making to
the audio engine), which completely kills PyDAW for the mixing-a-band
use-case...

So, I introduced a whole slew of utility functions to convert between the
musical time and absolute sample count domains, and reintroduced the
functionality...