You can't compare the GO performance with a mechanical tracker action. Its more like a electrical/pneumatic tracker organ, which offers less control. The various releases allow to fix reverb issues. If you just press a key very shortly, the is only little reverb and using a sample with full reverb will sound strange.. If you keep a key pressed for a longer time, the reverb builds up and it does not matter anymore, how much longer the key is pressed. Therefore there are only different short releases - mostly on wet sample sets with lots of reverb. Do you think, that playing a short release and little reverb after a long pressed key will sound like you expect? In my option, this would need recording a different set of releases - so it wont' work with existing sample sets. To start such a project, we will need support of sample set creators, who will create such recordings. Have you talked to them, if they show interest?