Hi,
I don't really use gapless much these days, so I can't confirm the situation with regard to any particular ASIO plugin, but I linked to an ASIO out plugin with added volume control as per this thread:
http://forums.winamp.com/showthread.php?t=451730
I had trouble getting this to work on Windows 10, but was flawless on 7.
Hope this helps in some way!