A few minor changes, read below

Clean up big pieces for a temporary hotfix, an overhaul soon to come
Refactored BGM and SE playing
Moved draw code completely into gamemode - mod makers can now control everything on screen

tetris/rulesets/ruleset.lua

@@ -161,11 +161,6 @@ function Ruleset:dropPiece(
 	inputs, piece, grid, gravity, drop_speed, drop_locked, hard_drop_locked,
 	hard_drop_enabled, additive_gravity, classic_lock
 )
-	if piece.big then
-		gravity = gravity / 2
-		drop_speed = drop_speed / 2
-	end
-
 	local y = piece.position.y
 	if inputs["down"] == true and drop_locked == false then
 		if additive_gravity then