Manual Role Swap

Manual Role Swap lets you swap which deck the Fusor player treats as incoming and which as outgoing with a single click. It's the user-triggered counterpart to the automatic role swap that fires when a transition completes.

The button lives in the toolbar's session group, alongside Pad Mode and the pin-on-top icon: two arrows pointing in opposite directions on a neutral dark button. It's a momentary action rather than a toggle, so it never lights up.

When to use it

Roles swap on their own every time a transition completes, in Blind Mode too, where the engine finalizes the run itself at 100% rather than waiting for deck-stop telemetry. Swap is a correction tool.

Use it when a run leaves the roles wrong:

You armed with the roles the wrong way round, aborted, and want to swap them before re-arming.
You reloaded tracks by hand and the deck that's now playing out isn't the one the Fusor player thinks is outgoing.
An abort re-derived the roles from the crossfader position and picked the opposite of what you wanted.

When the button appears

Fusor Studio hides the Swap button when it's not relevant:

Always visible in Blind Mode.
While Online, visible by default. Show Manual Role Swap while Online in Settings → General controls this. Switch it off to hide the button while Online, since auto-swap on completion handles roles for you.

When the button is disabled

The Swap button stays visible but goes inactive whenever a swap would be rejected. That covers two cases:

A transition is under way. Swap is accepted only when the Fusor player is unarmed, or armed with progress still at zero. Finish or abort the run first.
Pad Mode is on. The button dims and its tooltip reads Swap roles (unavailable in pad mode).

If you click while the button is enabled, roles swap immediately and the direction indicator updates.

What happens when you swap

The swap is symmetric: incoming and outgoing exchange addresses. Any UI that reads role assignment (the direction indicator, role-based bindings in the loaded fusor) re-resolves to the new assignment. The swap can also move your channel faders and crossfader to the start position for the next transition, and undo a coupled Tempo Ramp. Both are described below.

If a fusor is loaded, its role-based bindings (incoming.*, outgoing.*) re-resolve to the new decks immediately. The next time the fusor runs, it will target the swapped decks.

The Play button and the Tempo Ramp follow the new roles at once:

Swap onto a deck that is already playing. That deck is now outgoing, so Play is available straight away. You don't need to stop and restart it. An armed Tempo Ramp sets up for the new pair.
Swap while the Tempo Ramp is coupled (blue). The coupling was made for the old pair of decks, so the swap undoes it: sync goes off on the deck that was incoming, and tempo master goes back to whatever held it before. The ramp then sets up again if the new outgoing deck is playing, and otherwise waits (yellow) until it plays.

Faders and crossfader after a swap

Two switches in Settings → General set the mixer to the start position for the next transition when you swap. Both are on by default.

Set channel faders when swapping roles. The new outgoing deck's channel fader goes to full and the new incoming deck's goes to zero.
Reset crossfader when swapping roles. The crossfader moves all the way to the new outgoing deck's side.

The faders move first, outgoing then incoming, and the crossfader last.

These moves apply to a swap you trigger, from the Swap button or a controller button mapped to Swap. The automatic swap when a transition completes moves nothing.

The roles always swap. The faders and crossfader are left alone when:

The deck that becomes incoming is playing with its channel fader up. Neither move happens, and the status line shows Deck B playing: faders left (with that deck's letter). A deck that is playing with its fader at zero, or is stopped, does not block the moves.
You are in Blind Mode. Neither move ever happens.
The Fusor player has no reading of that deck's play state or channel fader. Neither move happens.

Three things to know

Swapping after every run means something upstream is wrong. Auto-swap handles the normal case in every mode, including Blind Mode.
Swap does not start or stop either deck. Besides the role labels, it changes only the faders and crossfader (when those settings are on) and a coupled Tempo Ramp.
After an abort, check the direction indicator before re-arming. Abort re-derives the roles from where the crossfader ended up, which can be the opposite of what you had.