I think the Tech 21 pedal u mention is capable of clean sounds.
I have a VT bass pedal by tech 21 and it does the clean and the distorted.
However, going down that route will lead you to a colored-tone. Which is not a bad thing, depends on your needs.
I'm actually finding myself not using my Tech 21 pedal anymore, simply because I love the sound I'm getting out of my amp. BUT, I always use a Sadowsky Outboard Preamp pedal.
The Sadowsky outboard preamp simply beefs up my sound, lets it sit in the mix better, and is transparent.
I recommend that you try these more transparent preamps, and try it in a band setting. It sounds like that will fulfill ur needs
