Quoting Pablo Fernandez <pablo.fbus(a)gmail.com>om>:
As regards jack master transport, latest ardour2 is
working fine with jackd
0.118.0 but it still has this little problem with jackdmp 1.9.5:
http://tracker.ardour.org/bug_view_advanced_page.php?bug_id=2856
When you run 1.9.5 (with Ardour 2.8.8 and Hydrogen 0.9.5-beta2 at
least) you don't have to set Ardour as Master.
Without it, if I click anywhere on the timeline in Ardour, Hydrogen
jumps to that spot.
It also works the other way around if I click somewhere in Hydrogen.