ZS37D CLASS 37 ALL TYPES DIGIDRIVE SOUNDFILE FOR ZIMO DECODERS

New revised and updated class 37 soundfile information for Zimo sound decoders. Oct 2013.

Class 37 DigiDrive E Version V4.0

Please spend a few moments to read these notes which have been produced so that you may obtain the maximum satisfaction from your new sound scheme.

The sounds should work perfectly when the decoder is fitted correctly. Individual locos may require some fine tuning that you can achieve with your DCC controller.

What is EasyDrive?

This is a system developed to allow more prototypical sounds to be deployed across a wide range of operating conditions.

The sounds have been programmed in such a way that you, the user, may change the way that the sounds respond to your driving style or needs. This avoids the need for reprogramming and all the additional costs that would imply.

Please note that in all driving schemes listed below, small speed step increases or decreases will normally produce the best results in terms of matching sounds to loco movement.

Some of the new controls will not operate correctly if you use 14 or 28 speed steps. Please ensure you use 127/128 speed steps to get maximum advantage of these important additions.

Throttle Response Scheme.

As supplied, the decoder will produce the sounds of an un-refurbished Class 37/0. CV265=101.

For the default refurbished class 37/4 and other later variants set CV265 to 104

Use F1 to switch on the sound. After the start-up routine the loco will stand with the diesel engine, the Prime Mover (PM), ticking over at idle. 

The sounds will respond to the throttle control in the following way:

Select speed step 1. The brakes will release, the PM will increase power to get the loco moving, and 

will continue until at higher speed, a further ramp up will be initiated until the final high speed running sounds begin. The precise speed steps will depend upon your model, so I suggest you make a note of the actual figures for your later use.

The sounds will spool down at similar points on deceleration.

Notice the complex transitions between the sounds. It can be quite entertaining to switch between speed steps just below and just above each threshold; the sounds change dramatically but with little change in speed. This is also prototypical, depending upon gradient and load.

In this, EasyDrive Version 4, there are extra control features to further enhance your driving pleasure.

Coast Mode

No matter what actual speed your model is travelling at, or which engine note range is playing, pressing  F key 6 will put the sounds into ‘Coast mode’ by spooling down the sounds to the appropriate level.

You still have full control of the speed, but the coasting sound will continue until you switch off F key 6; at which point the sounds will change to those relevant to the current speed. (Which includes standing).

Hint. Try using F key 6 to spool engine sounds down before throttling down to a halt – no more thrashing locos standing at signals or platforms. Remember to release F key 6 before setting off again!

Note for Version 4.0: This remains true and can be used in all cases from all speeds, but an alternative and automatic feature now spools the engine down to idle prior to stopping, provided the initial speed is not too high. See below.

Spool Down One

If that wasn’t enough control to shake a stick at, there’s more!

During any driving sound ‘loop’, at any speed, it is possible to cause the engine power to spool down to the level immediately below. This is easily achieved by reducing the speed by one step, or more. E.g., if the loco is playing power band 3 sounds, reducing speed with your throttle by one step will cause the sound to immediately spool down to the sound of power band 2, if in power band 1, it will spool down to idle.

This is a different control to F6 which always spools down immediately to idle/coast.

A further difference is that IF you have spooled down with this technique, acceleration of one speed step or more will immediately ramp the sound back up to the higher power. So you can now, at any road speed, vary the engine note by reducing or adding a single speed step.

Light Engine

Activated by F5, this enables multi-function changes with one key. Idle sound will be held for the first portion of driving, enabling yard movements etc without engine ramping. Alternatively, large throttle movements will produce a ramp up for a few seconds initially, then engine will return to the level appropriate to the new speed. 

Whilst this has always been possible with F6 engaged before moving off, the difference here is that engine sounds will ramp up and stay up once a new threshold is reached. The switched features also include reduced inertia setting and delay automatic engine ramps until  higher speeds are reached.

F5 can be operated at any speed to give a fourth way in which the engine sounds at a given road speed may be modified instantly. 

Applying More Power

Fed up with your loco dictating how you should drive? Now, you can call for more power from the engine at any intermediary speed. The duration of the increased power is configurable (default about 6 seconds) and is achieved by large (10-20) speed step increments This causes the engine to ramp up and down automatically.

CV Changes.

If you require the sounds of a refurbished Class 37/4, you only need to change CV265 to a value of 104. All of the above driving tips apply, but with the respective sound files.

If you have a short end to end layout, CV265 = 102 (For 37/0) or CV265 = 105 (For 37/4) will change the way the decoder responds to your controller by changing many other CVs simultaneously. The main outcome is that the upward sound transitions begin at a lower speed and occur more quickly. (It’s possible to get a ‘00’ loco from standstill to full thrash and back down to idle before stopping - all within 6 feet of track!.

Thrash

Also new to this enhanced version is a fresh set of sounds and controls specifically designed to get your loco thrashing at full bore from very low speeds, ideal for heavy trains on short layouts (but great fun anywhere).

These are accessed with CV265=103 for 37/0 Thrash and CV265=106 for 37/4 Thrash.

The Thrash sets work similarly to the other driving schemes, except that the engine is either idling, at full thrash or transitioning between these two states. Speed Step 1 will begin loco movement and a simultaneous ramp up to full thrash which will then continue at all higher speeds. 

Even the most enthusiastic thrashers amongst us like a quieter period now and again, and so F key 6 can be used to put the sounds into ‘coast’, without affecting loco speed. Switch off F key 6 and the thrash starts again!

Of course, reducing the throttle by one speed step at any road speed will also cause the engine to spool down to idle, but in this case, acceleration by one speed step will start the thrash sound immediately

(To move off without thrash initially, engage F6 before moving off, and release F6 if and when required)

It’s now down to your skill and knowledge to simulate any eventuality!

Driving Technique

At any time, and in any sound set, F6 will force the sounds to either hold idle or spool down to idle sounds. This affects only the sounds, actual speed is unaltered.

So, you can engage F6 before moving and the sounds will continue at idle even when the loco moves. Use this for light engine movements, where no extra power is required.

Or you can use F6 when already moving and the sounds will revert to idle for Coasting.

Releasing F6 in both cases allow the sound to go to the appropriate power level determined by the throttle position.

A new feature allows the power to drop to the next power level below if you decelerate by one speed step. Acceleration of one speed step allows the sound to return to the higher power. This works in any power band. Useful to switch between power levels at speed.

Try this:

These effects will operate in all sound sets, but the impact will be most pronounced in sound set two (CV265 = 102 or CV265 = 105). The speed steps shown are just an example, it will operate similarly at all speed steps.

Engage F6 before driving off. Accelerate to speed step 20, release F6. The power will instantly begin to rise to full power.

Repeat the above, but before releasing F6, reduce the speed step to 19. Now the power will ramp up to the intermediary power only. Increase speed step to 20 and it will rise again to full power.

Or this:

Change direction.

Release F6 before driving off. Now the engine will ramp up the power. (Simulating a heavy train on the hook).

Congratulations, you now know how to roll, light engine, up to a train. Then couple up and drive away under power.

Remember.  These new features will not operate correctly in 14 or 28 speed step modes. Using 126/127 speed step mode also allows imperceptible speed changes which nevertheless still trigger the sounds to change as described. 

If you reduce speed gradually before stopping, the project will put the loco automatically into Coast mode at low speed, enabling a dignified halt without the engine sounds playing at full power. This is an automatic, low speed, alternative to manually controlled coasting using F6.

Engage F6 before driving off. After a short distance, stop the loco.

Press F7.