What are /r/Guitarix's favorite Products & Services?

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Something like this: https://www.ehramazon.es/Behringer-UM2-Interface-audio-sampleado/dp/B00EK1OTZC

Generally any USB audio interface with instrument input (that is the important part) will do. Behringer makes decent audio interfaces, but the UM2 is the cheapest one, it might be a good idea to invest in a better model, if you can afford that, but for start UM2 should be enough.

There is a official package for arch:

https://www.archlinux.org/packages/community/x86_64/guitarix/

you may try if that one have the same issue.

En un principio usted solo puede conectar Jack a una sola tarjeta de sonido:

https://jackaudio.org/faq/pulseaudio_and_jack.html

En Qjackctl se hace atrevés de SETUP->Configuraciones-> Avanzado.