[RedSword]

By "Round ending" I presume you mean the moment where players are being respawned so a new round can begin (I say that because the round_start is right after player spawned, and round_end is when a team win; so there is a few seconds of "overtime") in CSS.

Round ending cuts all sounds on all different channels used by the game IIRC.

You can kind of understand that (only on one channel though) without any plugins : play in a game. When a team win, type "play aSoundSubFolder/aSound.mp3" and press "enter" just before the round restarts (you may need quotes if the file contains some special characters). The sound being played will be cut-off (you better try with a long .mp3).

Red