The changing of the chip for me allowed the envelope to trigger. Part of my problem at the time was my effect signal was cut off at the expression pedal input because I wired it wrong. So using an audio probe helped because while I still had sound when it was engaged it was dry sound with no wet. I would definitely start following the audio path through with a probe. I jumped all my loop and expression pads initially to sort it out. Kevin at Aion in his build doc talks about how even he had issues with triggering and changed around ics.
When you say you jumped the loop and expression pads you mean using jumper cables to connect the send and return? The reason i ask is I built a tight metal and once boxed up wouldnt work out yes in no until I don't know why maybe read it but used jumpers for the 2 fxloops the pedal has and then the pedal worked I finally pulled it out and jumpered it on the board getting rid of the loops Fantastic pedal by the way I've since built 4 and they all mild deviations in over all tone each one brings it I personally can't say enough as I go on about it............
sorry I know that's alot for a simple question