Combo Switches (“flipper cancel”, etc.)¶
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MPF contains support for “combo switches” which are special combinations of switches that post events when they’re hit together.
The most basic example of this is the “flipper cancel” combination, where a
player can cancel a show or bonus by hitting both flippers at the same time.
In fact MPF contains built-in support for the flipper cancel combo. If you
add the tag
left_flipper to your left flipper switch, and
to your right flipper switch, then whenever the player hits both flippers at
the same time, an MPF event called flipper_cancel will be posted.
Combo switches are also used for things like different kinds of skill shots. For example, in Attack From Mars, if the player hits the launch button, the ball is launched into the pop bumper area, but if the player holds down the left flipper button while pressing the launch button, the ball gate (Bally part A-17796) in the upper playfield is raised and the ball is allowed to pass through and is delivered to the flippers for an attempt at a super skill shot. The left flipper + launch button combination is something you can enable with MPF’s combo switches.
MPF’s combo switches also generate events once both switches are hit together, then one switch is tapped while the other is held in. This can be used to scroll through certain information screens with one button while the combo is active.
You can set various timing options for combo switches, including how close together the two switches have to be hit to count as a combo, how long they have to be held, and how long they have to be released.