How to remove click sound when PC2 is triggered

There is an annoying bug with the PC2 (on both Yocto2 I have build so far). Each time it is triggered there is a noticeable click. You can hear it especially when using the triangle waveform.

It sounds like this:

https://www.youtube.com/watch?v=9_ccGSwsab8[/video]

I discovered that removing R5 (220k) solves the issue:

https://www.youtube.com/watch?v=mm_31Lx0IOE[/video]

So my recommendation is to remove R5/ leave it out completely.