Really strange! Currently Zynthian doesn’t know nothing about clocks, but clock message could be the cause of missing the note-off messages. Perhaps some message buffer is overrun …
@christianforshaw, could you disable the internal clock for the monologue (if there is internal clock) ?
Anyway, if the problem is “clock messages”, i think i could solve it:
1.) First “quick and dirty” solution: add “clock messages” to MIDI router so we can “IGNORE” it.
2.) Second, find the exact place where the problem is located and solve it. Knowing the origin is a lot easier to find the problem