I've got the samsamp Bass DI/Driver as the last pedal in my signal chain. It has to go last in order to get my other effects to the PA. I use it as an overdrive and it spends most of the night in by-pass mode. However I've noticed that if I try and use a wha or other effect (except overdrive) while the samsamp is switched on, it seems to block it. Has anyone else noticed this? Normally I'd move the offending pedal to a different part of the signal chain, but it's my primary DI so I can't.