Spectrum Steam Sound User Guide(1.4MB) - Bachmann

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Advanced ProgrammingFor the purposes of setting up the DDE, we suggest you start with the DDECVs set to their default values. Set the exhaust (CV 131) and rod clank (CV135) volume levels to their default values of 128 and 32 respectively. Thenset CV 3 and 4 to a value of 40 to enable the momentum. For the time being,disable the DDE by setting CV 177 and CV 178 to zero. Note: The value forCV 3 and CV 4 is selected for demonstration purposes only. Once you havethe DDE ‘tuned up’, you can go back and set CV 3 and CV 4 to a lower orhigher value as desired.Next, place your locomotive on a section of track that is sufficiently longenough for it to “stretch its legs” and get up to speed without worry of runninginto something. If you have them, a set of stationary test track rollers alsoworks well. Crank the throttle up and take note of the exhaust chuff volumeand tone.Bring the engine to a stop and re-enable the DDE by setting CV 177 to 10.Crank the throttle up again this time to a speed step somewhere around40 or so. Now, as the engine accelerates, the exhaust chuff should haveconsiderably more volume and a deeper tone.Allow the engine to get up to speed and notice that the exhaust soundgradually returns to its previous level. Then quickly turn the throttle down. Youshould hear a sudden drop in the exhaust chuff volume along with a reductionin bass level and an increase in the rod clank volume. As the engine slows,the sound levels will gradually return to their normal level. This is the basicThrottle Controlled DDE action. Once you have the DDE responding to thethrottle, you can begin experimenting with the various CVs.Throttle SensitivityTry changing CV 177, Throttle Sensitivity to a value of 1 (low sensitivity).Turn up the throttle to speed step 40 and allow the engine to reach ‘cruising’speed. You can modulate the exhaust sound volume by turning the throttle upor down but observe that a relatively large throttle change is needed to get abig change in volume. Now set CV 177 to 50 and again, bring the locomotiveup to speed. Note that this time, with a high sensitivity setting, only a slightwiggle of the throttle around step 40 is needed to bring about a large changein exhaust volume.Attack and Release TimesAs previously mentioned, CV 179 and CV 180 control how fast the DDE canreact to a load or throttle change. Try setting these CVs to 250 for a veryfast attack/release time. Set the throttle around 40 and allow the engine toreach speed. Vary the throttle above and below speed step 40 and you willhear the volume levels change almost instantly in response to changes in thethrottle setting. Now set CV 179 and 180 to a more moderate value of 5 andtry again. This time when the throttle is changed, you should hear the soundtransition more gradually from one level to another and very rapid changes ofthe throttle are almost ignored.Volume LimitsHopefully you’ve noticed that when the engine is accelerating, the exhaustOEM Steam Sound User’s Guide Page 39Return to Main User's GuideReturn to Table of Contents
Advanced Programmingvolume increases and the rod clank volume decreases. And when the engineis braking, the opposite occurs - the exhaust volume decreases and the rodclank volume increases. You can use CVs 181 thru 184 to limit how much thevolume levels will increase or decrease. During acceleration, CV 182 controlsthe rise in exhaust volume and CV 183 controls the drop of rod clank volume.A value of 255 for either CV produces the maximum amount of volumechange. Lower values result in correspondingly smaller levels of change anda value of zero results in no change at all.When the locomotive is braking, CV 181 determines the reduction of exhaustvolume and CV 184 controls the rise of rod clank volume. As with the othertwo Volume Limit CVs, a value of 255 results in the maximum amount ofvolume change. Thus, the upper and lower volume limits of a given effect canbe independently adjusted. You could for example, set CV 183 and CV 184 tozero so the rod clank volume is always constant. Setting CV 181 to 250 andCV 182 to 64 results in an exhaust sound that increases volume four timesunder acceleration but only drops 30% during braking. Try experimenting withdifferent settings to see what the results are.DDE Timbre and Cutoff ControlBy changing the value in CV 185, you can change the tone or timbre of theexhaust chuff. A lower CV setting results in a deeper chuff.Note that the exhaust cutoff automatically increases as the throttle increases.This helps keep the individual exhaust chuffs crisp and distinct as the chuffrate increases. You can control how much change to the basic chuff occursby varying the setting of CV 186. A low value results in only minimal changeand maintains a strong deep chuff regardless of locomotive speed. At higherspeeds however, the chuffs may begin run into each other resulting in astrange whirring sound. This can be corrected by programming a highervalue into CV 186. In general, the faster you are planning on operating yourengine or the higher you have set CV 116 (Auto Exhaust Rate), the higher asetting you will need for CV 186 to maintain the proper exhaust cutoff overthe locomotive’s speed range. Try setting CV 186 with different values andobserve the effect on the exhaust sound over a range of throttle settings.When properly set, you will get a nice clear exhaust bark over the entirespeed range of your locomotive starting with a deep “woof-woof-woof” at lowspeeds that gradually transitions to a light “chi-chi-chi” sound at high speeds.Load Sensitive DDEThe DDE and its effect on the exhaust sound can also be varied by changesin the locomotive’s load such as the number of cars being pulled or thegrade being climbed. The DDE accomplishes this by measuring the motor’sback-emf voltage which is proportional to the locomotive speed. When thelocomotive load increases, the motor speed drops as does the back-emfvoltage drops and the DDE interprets this change by increasing the exhaustchuff volume and deepening the exhaust tone. When the load is reducedas might happen when going downhill, the motor speed rises along with theOEM Steam Sound User’s Guide Page 40Return to Main User's GuideReturn to Table of Contents
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Page 41: Advanced Programmingresponse to a l
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Page 61 and 62: Appendix BList of Configuration Var
Page 63: ©2005-2006 Throttle Up! Corp.All R

Spectrum Steam Sound User Guide(1.4MB) - Bachmann

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