Is it possible to let a sample play all the way till the end, although there is another note on the same track in Renoise? If working with samples that already have some reverb, the next note would cut off that reverb, making it sound “wrong”.
Or do I have to use two channels for something like that? Like in the gool ol’ days… 
In the Instr. Settings of the sample/instrument in question, set the NNA (new note action) to Continue. That will allow the samples to continue playing when a new note is triggered.
Ah, just what I was after. Thanks alot! 
You may be aware of this already but you can expand the tracks in renoise to have up to 10 channels in the same track also.
Shortcut:
Ctrl + Shift + Right arrow (left arrow for opposite)
or use arrows present at the top of the tracks
From v1.5 its up to 12 tracks actually 
cheers
goes and checks out renoise for this new feature
Nice to know 