Ok that worked. Patches launched using button only produce audio while jack server is stopped. Any chance of having Sonic Pi and Pure Data working at the same time?
How should I configure the “connect” panel of the jack server? I thought It might be the issue behind the non working Sonic Pi commands that use the audio input. In the help section, Sonic Pi says that both, sound_in and live_audio will look for input 1 unless specified otherwise. I imagine the jack input of the Pisound is considered my input 1?