KA 134-style audio panel
A KA 134-style audio panel: one row of ten mechanical latching keys on a black plate, no lamps. EXT, 1 and 2 (yellow) under the MIC bracket pick where the microphone goes; BOTH, NAV1, NAV2, ADF, DME and MKR (white) and SPKR (yellow) select what is heard. A key that is on sits pushed in, lower than the others.
- Modeled on
- Bendix/King KA 134 audio panel, the standard faceplate (the one-row audio selector of a classic 172 King stack)
- Category
- Radios and panels
- Size
- 2 × 1 cells
- Version
- 2.0 · 2026-10-19
- Plan
- Pro
- Simulators
- MSFS 2020 · MSFS 2024 · X-Plane 11 · X-Plane 12
Features
- 1 / 2 transmit on that COM; one MIC key in at a time
- EXT, the third MIC position (the intercom / external mic): pushed, it sits in and releases 1 and 2 on the panel until one of them is pushed; the simulator keeps transmitting on the COM it did
- BOTH in: both COM receivers are heard; out: only the transmitting COM's
- NAV1, NAV2, ADF, DME, MKR, SPKR toggle their audio and the cabin speaker; the keys in are the ones the simulator reports on
- No marker lamps: the KA 134 has no marker receiver (MKR selects an external receiver's audio)
- No key in before the simulator says which COM transmits
- Keys and legends in the red flood with the backlight at night; the glareshield's warm light falls on the plate too when its dimmer is up (Settings > Dimmers > Glareshield, off by default)
On the iPad
- Tap a key to push it in or let it out; tap 1 or 2 under MIC to transmit on that COM, EXT for the intercom position
Keys and controllers
Map any of these to a key, a game controller's button or axis, or a MIDI knob (how):
- Transmit on COM 1
- Transmit on COM 2
- Audio NAV 1
- Audio NAV 2
- Audio DME
- Audio ADF
- Audio MKR
- Audio SPKR
Simulator data
What the Hub reads from the simulator for this instrument, and what the instrument sends back. Names are the simulators' own: MSFS SimVars and events, X-Plane datarefs and commands.
Reads
| Value | MSFS | X-Plane |
|---|---|---|
| Audio panel keys lit, one bit each (AudioBit: nav1, nav2, dme, adf, mkr, spkr) (bitfield) | NAV SOUND:1 (bool)NAV SOUND:2 (bool)DME SOUND (bool)ADF SOUND:1 (bool)MARKER SOUND (bool)SPEAKER ACTIVE (bool) | sim/cockpit2/radios/actuators/audio_selection_nav1sim/cockpit2/radios/actuators/audio_selection_nav2sim/cockpit2/radios/actuators/audio_dme_enabledsim/cockpit2/radios/actuators/audio_selection_adf1sim/cockpit2/radios/actuators/audio_marker_enabled |
| COM transmitting: 1, 2, 0 none (enum) | COM TRANSMIT:1 (bool)COM TRANSMIT:2 (bool) | sim/cockpit2/radios/actuators/audio_com_selection |
| COM1 heard (1/0) (bool) | COM RECEIVE:1 (bool) | sim/cockpit2/radios/actuators/audio_selection_com1 |
| COM2 heard (1/0) (bool) | COM RECEIVE:2 (bool) | sim/cockpit2/radios/actuators/audio_selection_com2 |
Sends
| When you… | MSFS | X-Plane |
|---|---|---|
| 1 / 2 keys (MIC) | COM1_TRANSMIT_SELECTCOM2_TRANSMIT_SELECT | sim/cockpit2/radios/actuators/audio_com_selection (6 = COM1, 7 = COM2) |
| BOTH key (hear / stop hearing the non-transmitting COM) | COM1_RECEIVE_SELECTCOM2_RECEIVE_SELECT | sim/cockpit2/radios/actuators/audio_selection_com1sim/cockpit2/radios/actuators/audio_selection_com2 |
| NAV1, NAV2, ADF, DME, MKR, SPKR keys (SPKR: MSFS only; X-Plane has no speaker dataref) | RADIO_VOR1_IDENT_TOGGLERADIO_VOR2_IDENT_TOGGLERADIO_DME1_IDENT_TOGGLERADIO_ADF_IDENT_TOGGLEMARKER_SOUND_TOGGLETOGGLE_SPEAKER | sim/cockpit2/radios/actuators/audio_selection_nav1sim/cockpit2/radios/actuators/audio_selection_nav2sim/cockpit2/radios/actuators/audio_dme_enabledsim/cockpit2/radios/actuators/audio_selection_adf1sim/cockpit2/radios/actuators/audio_marker_enabled |
Add-on aircraft with their own systems may use other variables; the Hub reads the standard ones.
Changes
The instrument's version counts what its faces share (the case, the mechanism, the data, the sounds); a face's own version counts that face alone.
- 2.0 2026-10-19
- Drawn as the KA 134 it was taken from: mechanical latching keys with no lamps, a key that is on pushed in and lower; EXT, 1, 2 and SPKR yellow, the others white, black legends; the MIC bracket as printed; x134 TSO on the plate.
- EXT is the third MIC position: pushed, it sits in and releases 1 and 2 until one of them is pushed (no simulator effect).
- No MIC key shown pushed before the simulator says which COM transmits.
- The speaker (SPKR) can be driven from a hardware key or MIDI pad, like the other audio keys.
- Named KA 134-style audio panel in the picker.
- 1.0 2026-10-19
- First numbered version.
