The Zaz Drive has all those "Zen" tones that you've been looking for and more. It's a great pedal for light to medium gain rhythm tones and the lead tones have a really nice singing quality to the mid range frequencies. The Tone and Voice knobs work interactively, offering a wide range of sculpting, with the Voice knob allowing you to dial in the gain and bottom end to match whatever amp you may be using.
The Zaz Drive is a very smooth, Dumble styled overdrive that can stay mild or can be wound up for awesome solo tones. The gain range has been extended to offer all your typical "Zen" tones as well as higher gain settings, without changing the tone or feel of the pedal.