Instantiating large synths causes pops in audio

[sensestage]

@jreus Can you provide us with a test case?

[giuliomoro]

This is kind of expected: part of the processing when a synthdef is defined or instantiated is done from within the audio thread. If you see any mode switch happening, that'd be something to look into. If it's just a dropout, then it's an architectural issue and it may produce inevitable dropouts at small block sizes