Embedded Jack settings?

Hello guys,
I’m using Ardour 5.12 on ubuntu studio 18.04.

When I start Ardour, does it use the pre-existing jack configuration or does it create a new jack configuration?

Would it be better to start jack, with jackctl, before starting ardour?

The best is to not use JACK at all, and use Ardour’s ALSA backend.

If you need JACK for inter-operation with some other JACK apps, then yes. Prefer to start jackd with qjackctl. This allows more fine grained control, and also offers better system integration, particularly post-start commands to set up MIDI via a2jmidid.