On the PSR-500, there are two ways that AGC is turned on or off:
* Any "search" mode: the "SRCH Dig AGC" setting in the PGM GLOB menu.
* CONV and TSYS monitoring: the AGC setting in the CONV or TSYS object
The two conditions/methods have nothing to do with each other. That is, while monitoring a CONV or TSYS object, only that object's setting matters; the setting in the GLOB menu has no effect.