Keystoned Ed posted:Cannap - I think you will find a big difference between the older model QSI decoder used in AtlasO diesels and the later design QSI Titan loaded with a Q3 sound set. You will also experience better starting / low speed performance than the Atlas model due to Sunset's single motor drive setup. For owners of earlier 2 rail Sunset 3rd Rail diesels you may want to consider investing in a QSI Programmer ( possibly with friends in your area) so you can replace the Q2 sound set with a Q3 one (available on the QSI Solutions web site). I did that for my E7's and was please with the improved sound and operation.
Ed - I've had very little success with QSI decoders, oth Titan and older. No problems with the sound but HUGE problems running them in consists. For some reason if you have a 2, 3 or 4 unit lashup not all of the locomotives will respond to commands in a reliable manner. If you have a four unit ABBA consist only 2 or 3 locos will respond to function commands. Once that happens (and is is virtually every time) you have to turn the power off and on to get them back in sync.
