Do I need to run another software for transport control? I see this thread which details a bunch of strategies for transport sync. https://linuxmusicians.com/viewtopic.ph ... 95#p126653. I'm running jack_link and I can see it respond to tempo changes.
From this doc https://jackaudio.org/api/transport-design.html I gather that the tempo and transport concerns are separated in jack. Am I right in thinking that SL doesn't address transport? Ideally there would be a modular way to do this within Carla rather than in a DAW, because I am running as lean as possible with a 64 sample buffer and <20% of CPU.
Separate but related: I couldn't get Hydrogen to start on a SL downbeat either, though it also was able to get tempo from the loop length.
Any tips would be greatly appreciated!

T