I’ve done plenty lsd and psilocybin, I had had trips on both substances with very few open eye visuals and also plenty of open eye visuals. It really depends on your mind on the time of taking them. I typically will not get open eye visuals on just 1 hit of lsd. Damn near everytime on either substance, I will get closed eye visuals though.
Reaper is Linux friendly and free for 60 days, I would give it a try. It’s free after the 60 days but will prompt you to pay. The audio interface, I’m not to sure about, I personally do not run Linux.