[quote name='TG Flatline' timestamp='1325457006' post='1483404']
Possible daft question - are you getting the hiss with the pedals bypassed, or just with them engaged? Just worth considering whether the hiss is coming from your bass, or alternatively if you've got power and signal cables running side by side rather than perpendicular, as well as the suggestions above...
Another thing, get the TU-2 out of your chain and see if you get any improvement. I found in my rig it dulled the tone, not just taking some high-end, just killed the sound and added hiss. I have mine on an A/B switch and my rig sounds better both with effects on and bypassed. Google "Fulltone AB switcher" and grab your tools if it sounds better without the tuner! Other people don't have this issue, but I've heard many complain about it in the same way.
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It will be easy to test this - remove the TU2 and see what happens