I've tried looking into this and haven't found much luck.
I stumbled across a custom !stopsound command for the chat and I've had a look at the code. I can't figure how to alter it or create a new one that would point to the workshop or a webpage
function ulx.stopsounds( calling_ply )
for _, pl in ipairs( player.GetAll() ) do pl:ConCommand("stopsound") end
end
local stopsound = ulx.command( CATEGORY_NAME, "ulx stopsound", ulx.stopsounds, "!stopsound", true )
stopsound:defaultAccess( ULib.ACCESS_ADMIN )
stopsound:help( "Stops all sounds." )