program change synchronisation between two GM2

program change synchronisation between two GM2

My setup uses two GM2. one before the amp and another in the FX loop.
When sending a midi program change, the two units do not switch patch at the same time.
this creates a wierd transitionnal sound.
Is there a way to make both units switch at the same time?

Both have the same FW version, all patches have the same routing

Please help

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Source: http://forum.tcelectronic.com