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ESU 73900 LokSound Select 21-Pin 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


  • User selectable prime mover sound sets and horns
    Sound sets may be modified with the LokProgrammer
    21MTC Connector
    1.1 Amp Current Rating
    Operates on DCC & DC Analog
    Fifth Generation BEMF
    Six 250mA Function Outputs
    Special Lighting Effects
    8 Channel Sound
    Overload protection for motor and function outputs
    Size 1.18″ x 0.61″ x 0.21″ (30.0mm x 15.5mm x 5.5mm)
    Uses 4 or 8 Ohm Speakers (Not Included)

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”.

Of course, the LokSound Select supports all DCC-programming modes including Programming on the Main Track (“POM”).  Because of its unique low-power design, the LokSound Select can be programmed on the programming track of all popular DCC systems.  No programming track boosters or other circuitry will be needed.


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! 


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