If you use the analog DUAL VCO and turn the OSC 2 on only (the sub) and put the decay to max, there is a nasty click at the start of every note. if you want to play a sub bass with strong sustain, you can’t really do that without a nasty click. So basically, you cant use the analog vco for sub bass with sustaining bass because when you play the next note you will get a bad click. I know this is reported as not a bug, but it basically makes the sub bass (as its often used in modern music today like 808 sustained bass style) unuseable. Note: The decay does not have to be max, that was just for simplicity in the example. If the decay is basically anything above 15 it will do this.
The only remedy is putting more space in between notes and shortening the decay of the sub bass, which sacrifices the character of the sub bass sound, or sacrifices the note sequencing.
if you want to play the sub bass without a click, you have to turn the decay on the SYN page to nearly zero. So then you have more like a kick drum or a short stab, instead of a cool sustained drone sub.
when I use the sub bass on any other synth I own, and setup a similar patch, any click can be alleviated by adding a touch of attack. Adding attack on the Syntakt does not remove the click.
I know this has been discussed a few times, but I want to just bring an example to the table of how it interrupts sound design or limits sound design options. and the sustained sub bass is such a common thing we do!