Tune while you fly

The enable channel is an AUX channel. Its range uses the same 900 to 2100 µs scale as a mode, in steps of 25. FlySpark draws that span on the slot. While the live channel sits inside it, the card marks the slot active.

Inside means at or above the start, and below the end. A slot drawn as 1700 to 2100 µs is active at 1700 and not active at 2100. If you want the top click of a 3-position switch included, set the end one step past that click.

Outside the span, moving the change channel does nothing. That is the point of the enable switch: the value stays put until you ask for it. Check the live readout on the slot before you blame the rate.

The change channel is a different AUX. Above centre it steps the chosen value up. Below centre it steps the value down. At centre it holds. This is not the centre-value field. Centre value is a separate number on newer Betaflight, and 0 there means start from the setting already on the board.

A new slot adjusts roll and pitch rate. The same list includes yaw rate, the P, I and D gains, feedforward and horizon strength. Pick the one you mean. Stepping roll and pitch rate from a switch is a big change in the air. Use a small movement and a switch you can find without looking.

Some functions do not step a number. On Betaflight 4.5 those selections include the rate profile, PID audio, the OSD profile and the LED profile. Each position of the change switch picks a different option. The hint on the slot says so when the function is a selection.

INAV has its own function list. An INAV 7 board stops before the altitude-response entry that INAV 8 added, because that index would read past the older table. If a function you use on Betaflight is missing on INAV, it is not in that firmware's list.

Betaflight API 1.48 and newer add two fields, centre and scale, each from 0 to 2000. Centre 0 starts from the value already set. Scale is how far either side of that centre the step reaches, and 0 means the default. On a selection, scale is how much of the switch travel is used.

The Betaflight 4.5 demo speaks MSP API 1.46, so those two fields are hidden. You still get the enable range, the function and the change channel. Do not expect centre and scale on that demo, and do not assume a 4.5 board has them either.

The demo opens 30 slots on Betaflight and 20 on INAV. One slot in the Betaflight demo is already used: roll and pitch rate, enabled while AUX2 is high, stepped by AUX4. Empty slots are free. Add fills the next free one with 1700 to 2100 µs.

Props off. Move the enable switch and watch the slot. It should light only in the span you set. Then move the change channel and confirm the direction: high steps up, low steps down. If the slot never lights, the range does not cover the switch's clicks, or the firmware build has no adjustment feature.

A build without the feature shows one line: the firmware was built without in-flight adjustments. Adding a slot is not offered. That is a firmware option, not a missing wire.

Chrome or Edge connects over USB or Bluetooth. Android adds Wi-Fi. iPhone uses Bluetooth or Wi-Fi and has no USB host. Modes that share these switches are on the Modes tab. The rates themselves are on Rates.

A mode turns a flight mode on while its switch is in range. An adjustment changes a number, or picks a profile, while its own switch is in range. They can share a transmitter switch, and they still do different jobs. Arming on one range and stepping a rate on another keeps the two easy to tell apart.

The enable channel and the change channel should not be the same stick unless you mean them to move together. Channel 0 is AUX1. Add starts the enable channel at AUX2, which is channel 1, and the change channel at AUX3. The slot already filled in the Betaflight demo uses AUX2 to enable and AUX4 to step.

Save before you fly the change. Props off for the first test, the same as a motor check. Watch the active mark on the card. If it lights in the wrong click, move the range by 25 µs until the click you want is inside and the clicks you do not want are outside.

INAV adjustments use the same idea and a different function list. Return to home on INAV is a flight mode, not an adjustment, and it is not Betaflight GPS Rescue. If you only wanted a mode, set it on the Modes tab and leave the adjustment slots empty.