Metronome

**Metronome** is an unlockable activated item added in *The Binding of Isaac: Afterbirth †*.

## Effect

* Grants a random item's effect for the current room.

## Notes

* Beware using this as  The Lost or  Tainted Lost, as it can trigger self-damage items.
* Using this item multiple times in the same room will replace the previous item with a new one.
* Metronome cannot grant the effects of itself, , .
	+ Also unable to grant , , or .
* Metronome can grant items that haven't been unlocked yet.

## Synergies

* : If an active item was selected, grants the same wisp as that item. If a passive item was selected, grants any random wisp.
* : Isaac keeps any stat upgrades gained by a random temporary item as long as the item brings his stats over their highest value reached on that run.

## Interactions

* /  /  / : if Metronome is used while the shield is active, any stat changes or familiars/orbitals generated from Metronome will persist between rooms until Metronome is used again or replaced with another active item. Items that modify your stats and have other additional effects will keep the stats but the effect will be gone after leaving the room. For example, the tears down applied from  will persist between rooms, but Isaac will not shoot three tears at once.
	+ Some tear effects from items will remain active between rooms. These include:
		- , , , , , , , , , , , , , , , ,
	+ Some items behave unusually after leaving the room while the Holy Mantle shield was active:
		- Items that grant flight: Isaac's appearance is reset back to normal, but he is still able to fly.
		- : the mushroom familiar continues to follow Isaac, but doesn't grant an extra life.
		- : the tear appearance is reset back to normal, but the tears still travel through enemies.
		- : the tear appearance is reset back to normal, but tears can still explode when they hit an enemy.
		- : the tear appearance is reset back to normal, but tears will still leave green creep on the ground.
		- : does not persist between rooms.
	+ Sometimes, these interactions will even occur without a shield item.
* : Metronome is activated twice at once as expected, but the item chosen for the first activation is shown raised above Isaac's head, instead of the second one that actually remains active.
	+ Moreover, active item effects chosen by Metronome are only activated once.
* : Spawns the familiar for the current room, leaving the room it spawned in will only left the sprite over Isaac's head without doing nothing.

## Specific Item Effects

* Certain items used by Metronome have permanent, limited/unusual, or no effect. It is not clear what is intended and what is a bug.
* Permanent effects include:
	+ Health, coins, bombs, or keys that are granted to Isaac directly will persist.
	+ granted by  will persist.
	+ 's rerolled stat multipliers will persist,  or  will reroll all items permanently and  mimicking any of the previous also has the same effects.
	+ will permanently grant the passive version of Damocles.
	+ 's stat changes will persist.
	+ will restart the level.
	+ will work as normal and will cause Metronome to disappear from the active slot.
	+ will give Isaac a broken heart, spawn an item, and count as an activation of Magic Skin, causing future items to have a chance of being replaced by Magic Skin.
	+ absorbing passives and granting stats will persist.
* Limited and unusual effects include:
	+ Items do not spawn pickups and consumables that they might when picked up normally.
	+ Items that adjust Isaac's size will not do so.
	+ and  give no indication of extra lives, but will still work if you die in the room.
	+ will not remove red hearts or grant black hearts.
	+ will immediately activate without requiring Soul Hearts.
	+ and  allow picking up two trinkets in the room, but if another one is picked up outside, one trinket disappears completely along with the extra slot.
	+ only adds a black heart and does not remove curses.
	+ and  do not grant bone hearts. Brittle Bones can still be used to gain permanent tears ups if bone hearts are available.
	+ only adds soul hearts, no damage multiplier.
	+ will only restore one red heart without setting heart containers to 1. It also gives no extra lives.
	+ allows the picking up of two consumables while in the room and kept outside, but using them will lose the extra slot.
	+ will not grant an extra item for the next run.
	+ only grants flight, no Eternal Heart.
	+ , , and  allow picking up two consumables while in the room and kept outside, but using them will lose the extra slot.
	+ stats increases and Isaac's appearance revert on changing rooms, but Isaac retains the shadow of his large size, the ability to crush rocks, and invulnerability until the 30 seconds are up.
	+ will cause items in the room to be packed away into the box until you either find the Moving Box or Metronome gives you the Moving Box effect again.
	+ will not identify pills, but they are still guaranteed to not be negative.
	+ allows picking up two activated items while in the room and they can be kept even outside, but the extra slot and one of the items is lost if another activated item is picked up.
	+ will give Isaac two orbitals.
* The following items have no effect:
	+ Items that only spawn pickups or consumables are not mentioned separately.
	+ , , , , , , , , , , , , , , , , , , , ,
* The following items have a reduced chance of activating:
	+ (15%)
	+ (25%)

## Trivia

* The name, pickup quote, and effect of this item are a reference to the move 'Metronome' from the Pokémon franchise.
* This item works similarly to the item .