Your discussion on the old forum is still accessible (but read-only)
Manjaro Studio showcase - archived.forum.manjaro.org
I do not recall anyone else on Manjaro having mentioned use of Firewire hardware
but I did find someone on youtube recently who has been using a few Firewire devices on Linux
Interfacing Linux - Linux Game Cast - YouTube
For anything related to Firewire or MIDI you should look on linuxmusicians.com forum for the best expert knowledge
the personal setup video made by @unfa is excellent but I am working on a better way to configure a fresh Manjaro install for JACK realtime. Most of it is worked out but I have to check out recent changes to ALSA, PulseAudio and Pipewire
There is a package for realtime configuration on Arch distributions that would not be familiar to someone from another distribution.
It is not easy to find in the Archwiki page amongst a lot of other technical information, so it is often overlooked
Getting started
Configuring pam_limits (e.g. by installing realtime-privileges and adding your user to the
realtimegroup).
that package is sufficient to allow JACK to start OK
some of the other configurations on that Archwiki page are also needed to have JACK run well
but Archwiki has too much technical information that a user does not need to know
(if the configuration is done right JACK will keep on trucking as long as the rolling release allows so there is not much point to retaining detailed knowledge of this)
There is also a python script that makes configuration easier
GitHub - raboof/realtimeconfigquickscan: Linux configuration checker for systems to be used for real-time audio
That is still a bit technical and not easy for a new user to understand, so I expect anyone may need some help working through it
@Porru
I do not think OP is using KDE so octopi would not be needed.
OP probably already has pacman and pamac
you posted on here previously that Ubuntu Studio Controls is not compatible with Cadence
and Ubuntu Studio developers have said the same too
adding another JACK control package alongside Cadence and QjackCtl only seems likely to make the situation worse
Pipewire is still in early development and the only experience from Manjaro users is that it crashes PulseAudio and results in no sound. The developer has posted some screenshots and claims it is functional on Fedora, but there is no definite proof of much beyond that so far