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There are 2 distinct midi systems: The alsa kernel subsytem takes care of physical devices, that can be connected to apps that use the alsa interface. The Jack midi system is more recent, and is more suited to transmit midi messages between jack apps. There are several utilities to connect both systems: a2j can replicate dynamically all alsa midi ports in ...


You only choose audio card once when starting jackd. You can list cards available to alsa with aplay -l (aplay is part of alsa-utils). Then you can start the jack daemon, and pick the card to use with jackd -d alsa -d hw:<card>,<device>.

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