[Jackaudio] Software design questions

Hi Is there some drawbacks to instanciate more than 1 jack sessions in the same software? I mean there are 2 jackinit, 2 callback processes, 2 connections sets etc... In the examples found at https://github.com/jackaudio/example-clients only one midi event is fetched during each audio frame computation. Midi events are ASAP, there are no time codes. If the latency problems are OK, should I compute all of them before or after computing all the audio frames? Regards