Has anyone here had much experience with the Digitech Bass Synth Wah? Specifically, how good is the octave effect? Is it clean, can you set it so you just get the lower octave as opposed to it blending with the octave that you're actually playing, and does it retain the tone? I've used octave pedals before and they've all totally destroyed my lovely Thunderbird tone when turned on. So, is the Digitech worth getting for this, or is there anything else in the same kind of price range that's especially good? I am just looking for the octave effect, but anything with other effects built in, like the Digitech, would be fine too.