Sorry for the late response. I don't have much time to look at your problem.
For the ability to reverse the sample, the modification is not too difficult, you should find the solution on the forum (If this becomes impossible for you I could take 5 minutes to help you ). For the "click" problem, I don't know. I suspect the difference in speed between recording and playback.
I updated the main patch (axoloti-contrib/patches/gao/sampler.rockafella.axp) to correct some problems. I also updated your patch. Maybe this will fix the click problem.
sampler.rockafella.agoraphobe.axp (18.1 KB)