2009 mustang gt- trinity questions

[09stangman]

I am new to using a tuner, and am not fully understanding the meaning of a custom tune. The trinity has pre loaded tunes right? please explain "custom" tunes.

[concoursd]

custom tunes are made by a CMR dealer. There is a network of dealers that have purchased the DiabloSport CMR dyno tuning software. The CMR software gives the them access to more parameters in the computer for vehicles that need them. The Trinity can hold custom tunes made by one of these CMR dealers in addition to the pre-loaded tunes for mostly stock vehicles with minor bolt-on parts.