XPLM_MSG_FMOD_BANK_UNLOADING

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#define XPLM_MSG_FMOD_BANK_UNLOADING 113

Sent to your plugin before FMOD sound banks are unloaded. Any associated resources should be cleaned up at this point. The parameter is the XPLMBankID enum in XPLMSound.h, 0 for the master bank and 1 for the radio bank.