Any suggestions on a good sound for SD\GP35 sounds. I have searched and have heard various sounds for those locomotives but was wonder what they sounded like. I wish now I have paid more attention when I was growing up to the various sounds of locomotives. Any suggestions will be appreciated.
If you come across anything with the EMD 567D3A sounds, those will be the best bet.
I know MLW and MASW had a set in the library, as did Ron Furto at one time.
Do not use EMD 645 as some folks do. Those are inaccurate.
Search the descriptions in the file library using the term --- EMD 567 --- and you'll turn up quite a few, including the ones Shawn mentions. Also there are some newer NAVS sounds made for OR...which may have what you are looking for.
Cheers, Gerry
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Search the descriptions in the file library using the term --- EMD 567 --- and you'll turn up quite a few, including the ones Shawn mentions. Also there are some newer NAVS sounds made for OR...which may have what you are looking for.
The 567B/C/D won't work for a 567D2/3/3A engine as the latter engines are turbocharged. I have a 567D2/3/3A set in the works but I have other things taking priority at the moment (plus I'd need an appropriate locomotive).
For the moment, a 645E3 isn't quite accurate (as noted above), but it's a whole lot closer than a 567B or C with a roots blower (and the wrong RPM range).
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Hi, I found one years ago that is pretty good that I use. It is "masw567t.zip". It is for the turbo version of the engine. There are a few in the FL. I like this one the best.
The NAVS 645E3 sounds are serviceable for a 567D3A in a GP/SD35. Both the engine and turbocharger run at the same RPM schedules and aren't too dissimilar in how they sound. However, it would not be accurate for any other turbocharged 567 such as those in the GP30 and GP20. While only the turbocharger still has the same RPM schedule as the 567D3A and 645E3, that is true until notch 4. The turbocharger's clutch disengages when the engine is running at 515 RPM, and it's free to spin without mechanical interference.
The NAVS 645E3 sounds are serviceable for a 567D3A in a GP/SD35. Both the engine and turbocharger run at the same RPM schedules and aren't too dissimilar in how they sound. However, it would not be accurate for any other turbocharged 567 such as those in the GP30 and GP20. While only the turbocharger still has the same RPM schedule as the 567D3A and 645E3, that is true until notch 4. The turbocharger's clutch disengages when the engine is running at 515 RPM, and it's free to spin without mechanical interference.
Working with both GP35's and GP40's, I can comfortably say, they do sound very different compared to one another.. Prime movers give off a very distinct sound for each, and the turbo charger on a GP40 has more brute sound than that of a GP35. This is why I say, using 645's, even as a stand in, isn't truly accurate. The only time I've heard a 645 sound roughly the same, is a non turbo GP38, not firing truly on all cylinders, and the spark arrestors making a similar noise as the GP35 would.
The clutch doesn't "disengage" in the sense that a car's clutch does. It's an overrunning (freewheel) clutch similar to a bicycle's geartrain. This allows the turbocharger to run above the gear train's speed, but it won't drop below it. At high RPM, when the engine unloads and the exhaust flow drops (say, during transition), the turbocharger speed will drop, but it will only drop to where the gear train takes over. This also occurs when the WS10 system unloads the engine during slip conditions - which has long given railfans the false impression that turbocharger speed drops when engine load increases (i.e., under the exact conditions when the exhaust flow driving the turbine increases).
Anyway, my 645E3 sounds will work fine as a stand-in for the other turbo 567s if and only if you set the maximum RPM in the ORTS engine block at 900 RPM and then use the RPM table to set the correct RPM at each notch. OR will correctly scale the engine streams accordingly. This is how I was able to model the engine below idle on the 70-tonner. The 567D2/3/3A sounds I am working on are "universal" and also employ this technique.
With that said, you'd still have traction motor blower and inertial intake noise that doesn't make sense for a 567D2. I'll finish the 567D2/3 sounds eventually... along with a bazillion other things.
Originally posted by CSRX
Working with both GP35's and GP40's, I can comfortably say, they do sound very different compared to one another.. Prime movers give off a very distinct sound for each, and the turbo charger on a GP40 has more brute sound than that of a GP35. This is why I say, using 645's, even as a stand in, isn't truly accurate. The only time I've heard a 645 sound roughly the same, is a non turbo GP38, not firing truly on all cylinders, and the spark arrestors making a similar noise as the GP35 would.
The two major differences I can hear are:
1. The turbocharger used on the 567 has a distinctive triangle-wave sound to it that makes it sound "chirpy."
2. The 645 has a very distinct bass note compared to the 567 on account of the much greater displacement. The 645 exhaust note is a "thud," while the 567s is a "plunk."
Like I said - as a stop gap it's closer than a roots 567, but it still won't sound right.
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