I don't always post New Pedal Days, but I recently went down an envelope filter rabbit hole and amongst the field of contenders, the C4 won. "Gosh, mister, all I wanted was an envelope filter". I didn't realize I would have a religious experience. This thing is blowing my mind and maybe I'm new to the game, but this thing is a literal memory bank of tone. There is a moderate learning curve and use of the PC/Mac/iOS/Android app is required to tap into its potential, but the the pay-off is REAL.