clicking buffer

In the following patch two problems on clicking concur and I do not exactly why. The first is that, as soon as you change the sample thresholds banging the main patch, obvious clicks occur by effect of rough changes in amplitude and/or position. The second problem is that, as soon as I drag my pointer onto the sample [waveform object], whatever the direction is, a sequence of clicks occurs, this is even more audible when the threshold band gets narrower.

I did try to normalize this by using the trapezoid object at the subpatch 'polisher', and obviously it does not work out.
This clicking is especially audible in instrumental samples -use the attached 'multiphonics.aiff'.
Thanks for your help.