This new IPL file is configured to adjust this Series7 sound decoder to more closely match the prior Series6 default CVs, and performance settings.
CV57=6 and CV2=0 are main new defaults when a CV8:8 factory reset is performed after IPL download.
After IPL of these new version(s), write CV8 to 08 [as decoder factory reset], then a read of CV253 [IPL version] will now be 04.
A completed IPL will not modify any CV default or current settings, so your decoder settings are not modified to reflect this new IPL version until you write the value of 8 to CV8. You can do this write with a Service Mode or Mainline Program write.
A CV8:8 Factory reset will set CV60 scheme number to 0 and then update any scheme-configured CVS for scheme 0 in the SDF for the loaded sound project (.spj file).
If there is room in the sound flash, you can re-load just the SDF control file for a sound project without reloading all the matching .wav sound fragments.
If you have a multi-scheme .spj project, any write of CV60 to a valid available scheme number will reload that scheme, and execute any scheme-configured CV values.
CV10 on Series7 decoders allows adjustment of motor Back EMF sensitivity for motor performance variations. A value of CV10=0 is default,
CV10=32 will speed up the motor by about 50% and CV10=70 will slow it down by about 50%. Usable range is 32 to 70.
CV133 sets the Steam chuff cam rate for "scale mph" based on a "driver" size. [valid range is 8 to 127] . Default value is 60 or a 60" driver chuff rate, which further depends on the real gear ratio from the dc motor to driver for your model. This dmf for IPL version 4 now allows the Gear Ratio defined in CV134 to range from 6 to 199, over a denominator of /32. So the chuff rate may be changed in a range of 6 /32 to 199/32 (x6.2), giving an expanded control range. This ratio is multiplied by CV133/60 to derive the final chuff rate for your model. Both CV133 and CV134 combine to affect the chuff rate you choose. Digitrax Series7 8-scheme projects/.spj's use a nominal CV134 value of 16 to adjust for the two cam channels in use for steam chuff generation.