Audio crackling with built-in and USB DAC

Hey, I'm excited about the possibilities of the SamplerBox. However, I'm having trouble with audio quality. The audio is "crackling", particularly at low frequencies. For example, in the Demo preset, the bass drum in the drum loops causes crackling. Also if I play several notes simultaneously with the Saw sound, it crackles.

I am running it on RPi 3B with the official power supply (bought it specifically for this purpose, since Google suggested me that insufficient power supply would be a typical culprit for such issues). I have tried it with both the built-in DAC as well as a PCM2704 based USB DAC with similar results. I have also tried varying the "BLOCKSIZE" configuration parameter, "Low" and "High" give me the same results. Also, lowering the line out level has no effect to this issue.

Any pointers what I could still try to fix this? It starts to get a bit frustrating, as I'm running out of debugging ideas, and as is my SamplerBox is not really usable. Any help or suggestions highly appreciated!

Hi Orsku,
You might consider fiddling with the %%gain or %gain parameters.
The demo presets are on - and sometimes over the edge with their volume.
I've used the 3B without unresolvable issues in the past, but since I'm now using Pi4 I can't tell whether the increase of features has introduced the things you experience
Noek.