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ESU 73400 LokSound Select “6AUX” Sound Decoder



Full Throttle Features Are Now Here! 
MSRP: $109.99
Don’t See the file you want? Leave a note when you checkout!


Sound files with Full Throttle features are indicated with an (FT) at the end of the sound file name.

LokSound North American & Australian Factory Equipped Sound files. Use this link if you have a locomotive which comes with the option of factory installed Loksound. Use the sound file drop down menu to choose Factory Equipped Sound File. Provide the file number in the ORDER NOTES section on the Checkout page.

LokSound in Action
TDS Speakers & Enclosures

Need a Smaller decoder, but still need the options available in the LokSound Select decoder? The 6 output function LokSound Select decoder was designed with this purpose in mind!

  • Great NEW Size 1.18″ x 0.61″
  • Versatile DCC & DC “Dual Mode” decoder!
  • 8 channel sound system!
  • SIX lighting outputs and a 1.1A motor controller
  • Available with ALL Current LokSound Select Sound Profiles
  • Use 4, 8, or 16 Ohm Speakers

The LokSound Select decoder is a versatile DCC & DC “Dual Mode” decoder integrating a full-featured, 8 channel sound system, six lighting outputs and a 1.1A motor controller. While the LokSound Select only measures 1.18” x 0.59” (30mm x 15mm), due to its unique thermal design, it does not need any heat sinks.

We ship the LokSound Select with an 8 pin NMRA connector to make it a “plug & play” decoder. It also contains on board capacitance for smooth operation.

Operational modes

The LokSound Select can be used on conventional “analog” layouts and controlled with a DC power pack, but to benefit from all its features, we highly recommend DCC operation.

The LokSound Select follows all NMRA DCC standards and recommended practices.  It can be used with 14, 28 or 128 speed steps, supports two digit (7 bit addresses) as well as “4-digit” addressing.  Up to 29 function keys are supported.  The LokSound Select can change between DC and DCC operation at any time “on the fly”.


The LokSound Select comes with a 32 MBit memory chip.  The sounds are transferred to a class “D” audio amplifier via eight polyphonic sound channels. LokSound Select decoders offer the following unique features:

  • Multiple whistle and horns: the Select offers many whistle & horns. By just changing one CV, you can select your favorite one.
  • Playable whistle
  • 8 channel sound: The LokSound Select can playback up to 8 sounds at the same time.
  • Synchronized brake squeal: The LokSound Select will synchronize the brake squeal sound with the real movement of the locomotive.
  • Manual notching: The diesel speed steps can be either manually controlled by function keys or automatically based on the speed.
  • Individual volume control: The volume of all sound effects can be adjusted individually.

Steam decoders can produce over 20 sound effects, including the bell, air pump, exhaust chuff, coupler, steam release, cylinder cocks, brake release, side rod clank, blower, injector, Fireman Fred and many more. Synchronizing the steam chuff rate by using two CVs only virtually eliminates the need for a cam.

Diesel decoders can produce over 20 sound effects, including the engine start-up and shutdown, prime mover sounds through all eight notches, bell, air horn, air compressor, dynamic brakes, fans, brake squeals, coupling and uncoupling, detector sounds, rail clank and many more.

Customize your sounds

Unlike other manufacturers, LokSound Select offers you two options to customize your engine. The most simple is by using one CV. You can select the prime mover sound, the desired whistle or horn and the bell. Each LokSound Select offers various options on that.

You may at any time use the LokSound Programmer to download new sounds into the LokSound Select. We offer numerous “ready-made” sound packages for easy downloading.

 Superior motor control

ESU offers load compensation (using BEMF). While other manufacturers seem only to focus on the sound options, the LokSound Select offers the 5th generation of motor control resulting in a smooth and precise locomotive operation. Good motor control is mandatory for model trains: Even the best sound is worthless if the locomotive running is not smooth!

If you are using coreless or conventional DC motors, the LokSound Select’s unique auto-detection function can measure the characteristics and adjust the internal settings. There is no need to fiddle around with many CVs to adjust motor control. Due to Dynamic Drive Control (DDC) you can limit the influence of the load control and operate realistically and when going uphill the engine prototypically slows down.

Shining lighting effects

Each LokSound Select include 6 outputs with 0.25A current each that can be allocated individually to a light effect, which simulates the light patterns of many popular warning beacons. Besides D312 Rotary beacon, strobe and alternate flashing, there is a firebox flicker, smart flicker, Mars light, Gyralight, Ditch lights (two types), Oscillating Headlights, Stratolight and many more.

The Rule 17 dimmable headlight can be either controlled automatically or by function button. A LED brightness correction feature now also allows using LEDs for lighting effects. This is an important feature since LEDs do behave different than bulbs.

Built-in future

LokSound Select decoders are firmware-updatable. This means, the internal decoder software can be replaced by new versions, if necessary. For this, you only need an ESU LokSound Programmer and a PC.

Don’t Forget Your Superior Quality TDS Speakers! 

Additional information

Sound Files

ALCo 244 12cyl (FT)- 73401, ALCo 251B 12cyl (FT)- 73441, ALCo 251C 12cyl (FT)- 75422, ALCo 251C 16cyl (FT)- 75409, ALCo 251C 16cyl Dual (FT)- 75418, ALCo 251C 6cyl (FT)- 73491, ALCo 251C3 12cyl (FT)- 75414, ALCo 539T 6cyl (FT)- 73411, ALCo 539T 6cyl Dual (FT)- 73498, ALCo Goodwin 244 12cyl (FT)- 75439, Baldwin 606NA- 73446, Baldwin 606NA Dual PM- 75401, Baldwin 606SC 6cyl Dual- 75402, Baldwin 606SC_606A- 73447, Baldwin VO-1000 (FT)- 73481, Baldwin VO-6- 73405, CAT Powered 3608 (FT)- 75424, EMD 567A 6cyl (FT)- 75406, EMD 567B 12cyl (FT)- 75341, EMD 567BC 16cyl (FT)- 75411, EMD 567C 12cyl (FT)- 73460, EMD 567C 12cyl Dual (FT)- 73483, EMD 567C 16cyl (FT)- 73436, EMD 567C 16cyl GP10 (FT)- 75417, EMD 567D2 (FT)- 75423, EMD 567D3 16cyl (FT)- 73477, EMD 645C 16cyl (FT)- 75408, EMD 645E 12cyl (FT)- 73443, EMD 645E 12cyl V2 (FT)- 75433, EMD 645E 16cyl (FT)- 73426, EMD 645E 16cyl V2 (FT)- 75412, EMD 645E 16cyl V3 (FT)- 75421, EMD 645E 8cyl- 73407, EMD 645E3 12cyl (FT)- 73439, EMD 645E3 12cyl V2 (FT)- 75425, EMD 645E3 16cyl (FT)- 73408, EMD 645E3 16cyl Silenced (FT)- 75430, EMD 645E3 16cyl V2 (FT)- 75410, EMD 645E3 20cyl (FT)- 75407, EMD 645E3A 16cyl Dual (FT)- 73493, EMD 645F 16cyl- 73450, EMD 710B3B 16cyl (FT)- 75420, EMD 710G 20cyl SD80MAC- 73496, EMD 710G3A 16cyl (FT)- 73431, EMD 710G3B 16cyl (FT)- 75420, EMD 710G3C-T2 16cyl (FT)- 73425, EMD 710GB-16cyl MP40PH-3C- 73428, EMD F40PH- 73430, EMD/ASEA AEM-7/ALP-44 (FT)- 73495, FM 6cyl 38D- 73432, GE FDL 16cyl Early (FT)- 73445, GE 7FDL 12cyl Dash-7 (FT)- 73438, GE 7FDL 12cyl Early (FT)- 75405, GE 7FDL 16AE (FT)- 75428, GE 7FDL 16cyl Early V2 (FT)- 75434, GE 7FDL 16cyl Modern (FT)- 73440, GE 7FDL 16cyl V2 (FT)- 75419, GE 7FDL 8cyl (FT)- 73476, GE Cat 44- 73444, GE Dual FDL 16cyl U50 (FT)- 73421, GE ET44C4 Tier 4 GEVO (FT)- 75430, GE ET44C4 Tier 4 GEVO V2 (FT)- 75438, GE FDL 16cyl Dash-7 (FT)- 75413, GE GEVO-12 (FT)- 73423, GE GEVO-12 V2 (FT)- 75415, GE P42- 73482, GG-1- 73459, GMD 645C 12cyl (FT)- 75441, GMD 645E3B 16cyl (FT)- 75432, GTEL Turbine All Types (FT)- 75403, MLW 251E 16cyl (FT)- 75429, Steam Big Boy 4-8-8-4- 73416, Steam Heavy Locomotives- 73414, Steam Hunslet 2-6-0 Z27 Class (FT)- 75440, Steam Locomotives Coll.- 73417, Steam Mikado (FT)- 73474, Steam Shay- 73415, Steam SP 4-8-4 GS-4 4449 (FT)- 75437, Steam SP Cab Forward- 73409, Steam UP 4-8-4 FEF (FT)- 73490, Steam UP Challenger 4-6-6-4 (FT)- 73456, Steam Y6B 2-8-8-2- 73457, Trolley streetcar (PCC)- 73318, No Programming Required-, Factory Equipped Soundfiles-


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