Hello, It seems like there's a lot of zipper noise when changing the loop time in valpass. The parameter is listed as x-rate so I expected it to respond nicely to a-rate changes. I would think it natural that we'd get this zipper noise if there is no internal interpolation in the opcodce, I haven't looked at the source (what file is it in ?). If we allow the opcode to create zipper noise, we should state so clearly in the manual as it is easy to be fooled into thinking that it interpolates smoothly. An example csd attached, supposed to create a phaser effect with valpass. best Oeyvind