Re: A String of Digital Pedals = ?
This is a really good point, if you keep the signal levels within the limits required by the digital pedals (avoid clipping), then the quality should be as good as if the pedals were good analogue ones. The A/D/A conversion could not introduce any artifacts you can hear.
I've always thought digital pedals, of any sort from any manufacturer should have a common digital bus on them (like the idea of midi, not actual midi as that won't do, but like the idea of midi, a common digital standard) so you go into the A/D converter on the first pedal, then digital through the rest and then the D/A on the last pedal.
As for true bypass, people will never agree on this...