I’ve used this before. I have no idea what the name of this window is - but I use it to audition sounds.
I’m using HALion Sonic SE for drums.
There is a way to bring up a window that has a keyboard (on the computer screen) that allows you to play and hear (audition) the sounds WITHOUT entering MIDI notes. I find this convenient because I can figure out which note on the keyboard plays what drum part.
I’ve used this before - but I have no idea how to bring it up again - or what the name of that window is.