Mapping Mode lets you take any mixer control (volume, pan, sends, mute, crossfader) or any Bluhand device parameter and assign it to a Knobbler slider. This gives you a single, custom page of the exact controls you reach for most — a track's volume next to a reverb's decay next to a synth's filter cutoff — all on one screen.
Requires Knobbler4 device v60 or later and a compatible app version.
You pick a source (the control you want to map) and a target (the Knobbler slider it should live on). The app walks you through it.
On any page, tap the crosshair (⊕) button in the toolbar to enter Mapping Mode.

Every mappable control gets a green outline to show it can be a source. On the Mixer page, that's the volume, pan, send, mute, and main track crossfader:

Tap the control you want to map. Here we're grabbing the 4-Audio track's volume. It will start blinking:

Bluhand device parameters work as sources too — just navigate to the Bluhand page while armed and tap the parameter slider you want:

Shortcut: On the Bluhand page you can skip the Map button entirely — tap a
parameter's name to begin a mapping with that parameter as the source.
The Map button stays lit (armed) after you pick a source. Switch to a Knobbler page to choose where the control should go:

Valid target sliders are outlined in green. Tap the slot you want to map the source onto:

That's it — the slider is now mapped, labeled with what it controls, and colored to match its track. Mapping Mode turns off automatically.

Mapping Mode also lets you swap two Knobbler sliders — pick up the mapping on one slider and drop it onto another to trade their positions. This is the fastest way to tidy up a page: group related controls together, move a frequently-used parameter to a more comfortable spot, or shuffle an XY pad without re-mapping anything.
Here's a Knobbler page with three controls — a teal slider, a blue XY pad, and a yellow slider:

Tap the crosshair (⊕) button in the toolbar.

Tap the slider you want to move — it gets a flashing green outline to show it's selected. Every valid destination shows a steady green outline; tap the one you want to swap it with.

The source and destination trade places, keeping their labels, colors, and ranges. Mapping Mode turns off automatically.

Move vs. swap: if the destination slider is empty, this is a move — the
source ends up on the destination and its old slot is left empty. If both
sliders are mapped, it's a true swap.
XY pads survive a swap. Because an XY pad is just two slots grouped
together, swapping a parameter into one half of a pad keeps the pairing intact
— only the parameter shown changes. (A move that would leave a pad half-empty
splits the pad back into two separate sliders.)