The mixer is a row of inserts, each with a set of effect slots. Inserts have no New event: their events appear insert by insert, in mixer order. Each effect slot starts with a slot index event, and the plugin in the slot is described by the plugin events that follow.
PyFLP counts 127 insert slots in files from version 12.9 on: 125 numbered inserts, the master and a “current” insert, each with 10 effect slots. No source records a change in FL Studio 2026.
Mixer
| ID | Size class | Name | Holds |
|---|---|---|---|
| 0x1D (29) | Byte | Plugin delay compensation | Whether automatic plugin delay compensation is on. |
| 0xE1 (225) | Data | Mixer parameters | Mixer settings, as a block of binary data. |
Inserts
| ID | Size class | Name | Holds |
|---|---|---|---|
| 0x5F (95) | Word | Insert icon | The insert’s icon. |
| 0x93 (147) | Dword | Insert output | The insert’s audio output. |
| 0x95 (149) | Dword | Insert colour | The insert’s colour, from FL Studio 4. |
| 0x9A (154) | Dword | Insert input | The insert’s audio input. |
| 0xCC (204) | Text | Insert name | The insert’s name, from FL Studio 3.5.4. |
| 0xEB (235) | Data | Insert routing | Which inserts this one sends to, as a block of binary data. |
| 0xEC (236) | Data | Insert flags | The insert’s switches, as a block of binary data. |
Slots
| ID | Size class | Name | Holds |
|---|---|---|---|
| 0x62 (98) | Word | Slot index | The effect slot within the insert that the following plugin events fill. |