my favourite for tracking is to track through an 1176 set to 8 to 1 with the threshold at 18.25
attack at 2
and release at 6 (they're backwards on it) so thats actually a slower attack and release for an 1176..
oh yeah and make sure the V.U reaches a maximum of around 10 db attenuation... no more.
all button mode can sometimes work but is wildly unpredictable, and sometimes a little too savage(unless the singer is a pussy) and the v.u just does what it feels like