[LAU] Looking for Repeater/Stutter Plugin

Hi! I am looking for a repeater/stutter plugin. The effect is relatively simple, basically a sound buffer of a user-defined length (probably relative to song BPM) is recorded with incoming audio, then repeated on command. I was looking through the plugins that come with KXStudio, as I'm using Carla, but I didn't find one that does what I want. Renoise has one built in. It's called Repeater. It's good, but I would prefer a plugin version as I'm using Carla. And I'd prefer free software. There is 'pvsfreeze' which is a cool effect but it does something based on FFT, which is not quite what I want. Then there is Cabbage Stutter Filter. The GUI loads&looks OK in Carla but I didn't get it to work. It doesn't output any audio no matter what I do in the GUI. Maybe I'm using it wrong. I wrote a simple softsynth before, Wolpertinger, so I could probably develop a plugin like this myself. But as the effect is relatively simple, someone must have already made something like this. I want to use it in Carla, so the format doesn't matter much - native Linux VST, DSSI, LV2 or LADSPA would all be fine. Does anybody know of such a plugin? Or even a standalone JACK program? Thanks! J.