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ESU 54399 LokSound L V4.0 O Scale Sound Decoder



Full Throttle Features Are Now Here! 
MSRP: $179.99
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New from ESU Loksound: Full Throttle equipped sound files for super prototypical control of your locomotives. For more information CLICK HERE. 

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

LokSound in Action

TDS Speakers & Enclosures

The Brand New LokSound L V4.0 and LokSound L Select decoders are designed for S and O gauge locomotives.  The LokSound L V4.0 and LokSound L Select decoders can use all  ESU V4.0 and Select sound files respectively.

The LokSound L decoder is a combination of motor, sound and lighting decoder. You can install it in nearly any O scale locomotive with dimensions of only 2 inches in length and 1 inch wide! Made to plug into new Atlas and other O Scale locomotives, the L decoders will also come with an interface board for hardwiring into whatever locomotive you have.

With a constant current of 3 Amps continuous, the decoder’s load control will power all current O scale locomotives whether having 1 or 2 motors. The decoder’s hardware includes 9 function outputs, ability to run 2 servos, and inputs for 3 hall sensors (commonly used for syncing Steam Chuffs). You can also add 2 speakers as there are 2 separate speaker outputs (one Channel). Additionally, there is the ability to add an external volume control and external power pack. Add this to the powerful logic contained in the LokSound V4.0 and Select technology already on the market, and this new decoder is a force to be reckoned with! Finally “O Scalers” will have the Power, Sound and Motor Control they need, in a package that will fit in their locomotives!

*Tony’s Train Exchange does recommend that you consider upgrading to one (or if space allows, two) of our excellent series of TDS speakers, which comes in many sizes to fit your needs!

Operational Modes

The LokSound V4.0 recognises DCC, Selectrix® and the Motorola® protocol. It can be operated with 14, 28 or 128 drive steps or on analog DC layouts.You can assign the decoders to 2-digit, 3-digit (1-127) or 4-digit (1-9999) addresses as well as a consist address.

The Motorola®-protocol provides the operation of the LokSound V4.0 decoders with Märklin® control stations 6020®, 6021®, delta®, mobile station® and central station®. The decoders can be used with the addresses 01 – 255 on this mode. A second address provides the possibility to use the function keys F5 to F8.

The Selectrix® protocol provides the option to use LokSound V4.0 decoders with this established system. All established DCC brake systems like the well-known Lenz LG100, and the new Lenz® ABC brake units with asymmetrical DCC signal are recognized, as well as the braking on DC (with switched polarity) or on Selectrix® diode brake systems. You can also use the Märklin® brake system in DCC-mode.

V4.0 decoders are able to determine a constant braking distance, so your locos stop in front of the red signal, no matter what speed your loco is.

LokSound V4.0 decoders are also able to operate on AC layouts.

The decoders can switch automatically between all modes (AC, Motorola®, DC, DCC, Selectrix®) during operation.

Motor control

You expect excellent motor control from a LokSound Decoder. The LokSound V4.0 is equipped with the improved 5th generation of load control. You can adjust the control frequency with a basic frequency of 40kHz adaptively.

The decoder‘s load control is suitable for all common motors, by ROCO®, Fleischmann®, Brawa®, Mehano®, Bemo®, Märklin®, Faulhaber® or Maxon®. You can also use all-current motors as long as you replace the field winding with a HAMO Magnet.

SoftDrive® Sinus motors, which are often used on Märklin® locos can also be controlled by the LokSound V4.0 decoders.

The new serial communication protocol provides operation on Trix®-locos.


The most important element of the new LokSound V4.0 decoders is the sound chip. The LokSound V4.0 has an enormous memory of 32 MBit to save up to 276 seconds of original sounds.

The LokSound V4.0 works with 8 polyphonic channels; the decoder is able to play up to 8 different sounds simultaneously, using the 16-Bit mixer and the nearly noiseless D/A convertor.

All single sounds of the LokSound V4.0 can be mixed in volume individually on nearly every digital control station.

Analog mode

LokSound V4.0 decoders can be used on DC as well as on AC layouts. The motor and the synchronisation of all driving, sound and light functions can be controlled in analog mode.

Safe operation

If desired, you can connect a PowerPack (ESU Art.No. 54670) to the LokSound V4.0. This energy storage device continues to supply the decoder with energy if the power from the tracks is interupted.


A very important function of the LokSound V4.0 decoder is the integrated RailComPlus® function. Your locos will be recognized automatically by an appropriate digital command station and will receive, if needed, a new address. Forget about the cumbersome typing and programming!


All function outputs and the motor current output are overload protected.

Future built-in

You can update the firmware of the LokSound decoders. This means, the internal software on the decoder‘s memory can be replaced by new versions if necessary. You‘ll simply need the ESU LokProgrammer and a PC.

Sound variations

There are already more than 200 sound variations available for the LokSound V4.0

Don’t Forget Your Superior Quality TDS Speakers!