Why does my sustain pedal work in reverse in Logic Pro? How can I fix it?

This is typically a polarity issue — in other woeds, the pedal is sending the wrong MIDI data values (e.g., 0 when pressed, 127 when released when Logic is expecting the opposite).

Here’s a good video that covers it, or if you’d prefer to read below:

How do I fix sustain pedal polarity in Logic Pro?

Use the Environment window to reverse the MIDI data:

1. Open Logic Pro and press Command + 0 to open the Environment.
2. Create a Transformer object.
3. Route it like this: Sum → Transformer → Input Notes → Sequencer Input
4. Set the Transformer to filter or remap MIDI CC 64 values (sustain) to reverse the behavior.

Here’s some additional information

Q: What MIDI message is used for sustain?

MIDI Control Change CC64 is used for sustain pedal data.

Q: Are there other fixes?

• Check your pedal or keyboard for a polarity switch.
• Try software modifiers or consult community forums for device-specific tips.

Q: Any tips to avoid this in the future?

• Test pedals in multiple apps.
• Know your controller’s MIDI implementation.
• Learn to use Logic’s Environment for advanced troubleshooting.