I guess this is a bug of some sort, I'm just not sure who to blame :) Create two mono tracks Record something on track 1 Record something shorter on track 2 Add a TAP Eq on track 1 and a TAP Eq and SC4 mono on track 2 with the SC4 disabled. Play from the beginning and notice how the first track gets silent when track two stops ------- Remove/disable TAP Eq from track 1 and everything's fine or remove/disable TAP Eq from track 2 and everything's fine or enable SC4 mono on track 2 with the side effect that DSP load increases as track 2 ends (this is actually how I encountered the problem in the =20 first place; I was testing the latest JAMin when, during a passage =20 when both my vocal tracks that had the Eq/SC4 combo ended, things stopped working due to DSP overload) If you replace SC4 with SC1 enabling it shuts off all sound. This is tried with the latest svn (2024) of Ardour and the latest releases of TAP and SWH on an Athlon-XP 2000+ with 2.6.21.5-rt Can someone else confirm this?