This Lab #17 is a Phaser Machine, based on the late Blackout Effectors Whetstone Phaser. It's an evolution of the EHX small stone, an OTA phaser with a lot of mods.
This is the ultimate phaser machine, with two storable Rate, foot switchable with left footswitch. You'll get every control over your tone with this big pedal.
Production model is available here : Rckt Phzr