ALCO Century 420

ALCO Century 420

The ALCO Century 420 was a four-axle, 2,000horsepower (1,491 kW) diesel-electric locomotive of the road switcher type. 131 were built between June 1963 and August 1968. Cataloged as a part of ALCO's "Century" line of locomotives, the C420 was intended to replace the earlier RS-32 model.

Sound Projects

There is 1 Sound Project for this Locomotive
ALCO C420 251C_12 2000HP 16 bit project by John McMasters, added on Dec. 12, 2013

 C420 ALCO 251C_12 2000HP        11/12/2013
Project: NV0_4chnl_x6_C420.SPJ Version 1.3
SDF:   NV0_4chnl_x6_C420
BASE CODE:    NV0_4chnl_x6 -- Notch Volume, 4 Channel, SDF Ver 2
SOUND SET:    C420 ALCO 251C_12 2000HP -- Raw 44KHz
SERIES:        6

Author:  John McMasters    Custom sound scheme. Sept 25, 2013 NOT for resale.
    (C) Copyright John McMasters 2013, used with permission.

ALCO C420 ALCO 251C_12 2000HP
   This is the Sound Definition Langauge (SDL) file for a project that can be
   used for a typical diesel locomotive. Supported
   sound effects include bell, dynamic brakes, air brake system,
   and coupler crash.
     1) Use 4 channels (voices) avoiding previous version
    2) Assign large 44KHz 16bit sound samples for best
        audio results
    3) optional startup sounds disable when F0 is on
    4) Feature disable CV159 is HEX values to disable features like HEP mode:
                        bit1 disable hard automatic braking
                        bit2 disable startup sounds
                        bit3 disable Fans
                        bit4 disable toots on direction change    
                        bit5 disable grade crossing random play
                        bit6 disable bell    
                        bit7 fuel prime once for Gen1 diesels OR multiple start warning bells Gen2

(A) Function Key Usage:  
F0-     Lights           [disables startup sounds when on during initialization]
F1-     Bell
F2-     Horn    CV150 selects Horn type                
F3-    Auto Coupler    coupler clank and BRAKE if F3 is ON,  is dir chng and last PK spd below e.g. CV151
                 [Autocoupler/brake set by  CV151 max spd] F15 on for un-coupler
                 [Leave F3 on for auto coupler]    
     Toggle OFF plays directional toots
F4-    Air features disable         F4 is ON =disable AIR sound/FEATURES, trig BLOWOFF/drier then compressor ONE time
                     [F4 off enables pop-off, drier and compressor]
F5-     Dynamic brake fans when moving Otherwise:    Handbrake sequence    [Handbrake while stopped]  Handbrake loop will PLAY until F5 Off                        :
F6-     Notch UP     F6 is ON  trig BLOWOFF/drier then compressor ONE time /NOTCH UP...
             IF any manual notching: F6 is NOTCH UP and F7 is NOTCH DOWN!!
F7-     Notch down        [If CV155 is not 00 F7 is CROSSING HORN WHEN
                 AUTOMATIC notching selected in SCV155=0]
             F7 ON Is now notch down for EVENT, integrate -VE in SPEED_DELTA
F8-     Mute control            [F8 to ON is muted to cv volume, F8 off, set REG volume]
        EStop  on F8 with F9 on Shutdown    (disables motor movement until OFF)
F9-     Brake squeal            [Leave F9 OFF for auto brakes]
        EStop  on F8 with F9 on Shutdown    (disables motor movement until OFF)
F10-     Grade crossing horn sequence    [Bell stays on until F10 off]
F11-    Handbrake sequence    [Handbrake while stopped]  Handbrake loop will play until F11 Off    
F12-    Wheel Squeal    (continuous when moving) [Disables bell on F6]
F11-     UNCoupling     (disables toots on F3)
F14-    EStop Shutdown    (disables motor movement until OFF)
F15-    SANDER
F17-    BoxCar Boom
F19- Enables HEP MODE or CV159 is HEX values to disable HEP mode:
            OPT ONLY FOR LOCO WITH HEP MOTOR (like E8)  or HEP controls (like F40PH)
             (plays HEP startup and continuous HEPrun fan/notch sounds)
F28 is USER_CHATTER extended play sounds

(B) Diesel Sound FX defined CV's:     [decoder CV8=8  reset value in brackets]
CV58  Master Volume, 0-15, 0= max, (F8 used for Mute) [7]
CV60  Scheme select CV, 0=Steam    [0]
CV122 Product TYpe, 12 = Digitrax SFX sound decoder Read Only Value
CV123 Hardware Version        Read Only Value
CV132 Diesel Notch rate                64-120    [71]
CV133 Steam Chuff/CAM config, 128=>EXT cam, 1-127=>DRIVER dia in inches[63]
CV134 Steam gear ratio trim, 32=100% ratio,    [32]
CV135 Volume when Muted                0-64    [0]
CV139 Set to trigger distance event    0-64    [30]
CV140 Prime Mover Volume            0-64     [50]
CV141 Bell Volume                    0-64    [41]
CV142 Horn Volume                     0-64    [53]
CV143 AIR feature volume, drier, compressor, brake release Air sounds Volume 0-64 [59]
CV144 Dynamic brake volume 0-64 DIESEL DYNAMIC brake volume     [60]
CV145 Miscellaneous volume 0-64    [58]
CV146 Delay between Bells 1-100    [09]
CV147 Time between Drier cycles Users normally reset drier rate to 10 or more    [22]
CV148 Time between Compressor cycles    [30]
CV149 Compressor run time                [24]
CV150 HORN selector- 0=normal 2=playable    default 0    [00]
CV151 Speed limit FOR AUTOMATIC COUPLER/BRAKE on DIR chng. about 1/2MPH per unit [35]
CV152 defines USER code for this SDF
CV154 STEAM blowdown volume    [45]
CV155 fact default is AUTO NOTCHING; CV54 needs to be zero for F7 Notch UP  [00]
CV156 is 540mS HORN delay for SHORT    [20]
CV157 is FOR bell selection         [00]
CV158 is
CV159 is
CV160 is VARIANT id
CV161    Power Reverser volume                    0-64    [40]
CV162      Grate Shaker Volume                    0-64    [64]
CV163    Water fill/Coal fill Volume                0-64    [54]
CV164    Compressor Volume                    0-64    [60]
CV165    Steam Boiler Volume    Diesel Fan Volume        0-64    [40]
CV166    Coupler Slack Volume                    0-64    [32]
CV167     User Defined sounds 21-28 Volumes            0-64    [32]
CV168   Stoker Volume                        0-64    [32]
CV169 is HEX values to disable features like HEP mode:
;                        bit0 disable ARTICULATED steam HEP diesel
;                        bit1 disable hard automatic braking
;                        bit2 disable startup sounds
;                        bit3 disable Fans
;                        bit4 disable toots on direction change    
;                        bit5 disable grade crossing random play
;                        bit6 disable bell                
;                        bit7 fuel prime once for Gen1 diesels OR multiple start warning bells Gen2
CV170 Safety Run Time                    0-64    [32]
CV171 ALT HORN volume                    0-64    [60]
CV172 Water Pump Cycle Time                0-64     [19]
CV173 Cutoff Speed for Auto Cyl. blow down        0-64    [32]
CV174 Air Compressor run time                0-255    [10]
CV175 Stoker/oil pump run time                0-255    [20]        
CV176 F28_user run time scattered sounds        0-255    [20]
(C) General Notes

This is a functional tested version of a project using individual sound recordings for each prime mover notch setting. These
prime mover sounds can be played in three modes determined by CV155: automatic, semi-automatic and manual notching. In auto
mode, the prime mover notch is determined by the current speed setting, and is adjustable using CV132. In semi-auto mode,
the same is true but it is possible to "throttle up" to higher notches using F6 and F7, if you want your engine to sound
like it is working harder. Manual mode offers full control of the notch setting using F6 and F7, so you can throttle down
to idle and turn on dynamic braking while coasting downgrade.

Other features available in this project include:
- Automatic grade crossing horn sequence with bell
- Optional highball and backup horn signals while stopped
- Dynamic brakes at speed or standing
- handbrake while stopped
- Automatic coupler sounds when changing direction at low speeds
- Automatic brake squeal sounds when decelerating to a stop
- Manual brake squeal on F9 and moving
- Additional user-defined sounds on F14 and F15

This sound project has been assembled from Digitrax-supplied sound clips as well as new sounds from custom recordings.
Additional custom 16bit 44KHz files were used to edit individual sound fragments (WAV files for each file handle).
It will be a copyrighted project on acceptance by Digitrax.
Thanks are due to A.J. Ireland for their prior work in developing sound projects.

For CV155=01 ["Semi_automatic Notching"],  the Prime mover lowest Notch setting is set by
 the throttle speed setting. F6 (ON) can increase the Notch and F7 (ON) will decrease the
 Prime mover to the minimum notch set by current throttle setting.

The sound volume is controlled by Master Volume CV58 as well as any individual sound
volume CVs.  The Default for CV58 is 5 but can be set 0-15 from a Throttle or the sim-
ulated throttle in SoundLoader.  Individual sound volume CVs can be set 0-64.

------[end SDF/DECODER definition]--------------

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