hey ther all, got a new gp7 @ clearance ,it a p2k /qsi but its not what I was expecting . I have a set of p2k f7 /qsi and love the sound and dcc running characteristics so I assumed this gp7 would be very similar ,not the case on ether sound or running . now dont get me wrong the gp7 is good it just isnt in the same league . so is there different versions of the qsi/first gen emd ? and is there any tweaking I can do to make it more like my f7 .? ........some of the differences are the throttle notches rev sound is bla in the gp-7 and on dccrunnig it s a little more jerky when it comes to throttle response( Im sure this can be adjusted with cvs) but the horn sounds the same & p2k did a superb job on getting two speakers in that narrow hood ! any how ,any advise to sweeten this up would be helpful. J.W.
Short answer is yes, there have been several versions of QSI sound over the years, I think the current iteration is Version 7. Since your loco was on clearance, it might be an older version. You can query CVs 7 and 8 to determine which version you have, and then download the applicable Technical Reference Manual from QSI.
A higher quality, properly baffled speaker may also make a big difference.
If it's the early P2K with sound, it probably has an older version of the QSI firmware on the decoder. They do have replacement chips - it will enable better motor control options as well as have some changes in the sounds. Usually there are multiple options that have different horns so you can get one more closely matched to what should be on a particular loco.
--Randy
Modeling the Reading Railroad in the 1950's
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