Auto Gain setting in Djay Pro mac causes the ACTIVE track's volume to change abruptly. Major flaw that is making me consider disabling auto gain and not using the cross fader anymore and just riding the individual deck volumes.
Auto gain is only applied to a track after analysis is finished on a deck, so if your ACTIVE deck was playing while loading a track on the inactive deck that should have no affect on gain on the active deck. Can you please let us know what version of djay (e.g. djay Pro 2.0.13 for Mac) you are using and steps to reproduce this issue? Also does the same happen if you turn off Audio Limiter in mixer settings?