How long does scsynth “survive”?
Maybe this is caused by a faulty extension or dependency? Maybe purging the extensions folder could help as the installations share them globally AFAIK which easily can lead to confusing situations.
Some things that may can give a hint:
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Check the console logs - not to be confused with terminal
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Make a debug build of scsynth and attach a debugger on it and catch any exception, see e.g. How to setup scsynth debugging?
edit: also consider checking brew doctor