When you load a new project, the defaults are:
T1 - Kick machine
T2 - Snare machine
T3 - Metal machine
T4 - Perc machine
T5 - Tone machine
T6 - Chord machine
Any track can contain any machine (or several via Preset/Machine locks) and yes, you could for example, create a Kick preset from a Perc machine. Presets are all based on the machines listed above, along with specific parameters and effects settings. Each machine is best suited to a certain type of sound but things get interesting and unpredictable when you experiment.
The manual describes the machines as follows:
Approaching synthesis in the Model format, with its one-knob-per-function control, was a daunting task. We wanted focused controls, yet maximum sound-shaping possibilities. The solution was to take the FM engine from the Digitone and then completely re-arrange it to form six different machines: Kick, Snare, Metal, Perc, Tone, and Chord.
Each machine is a unique mapping of the engine, and we have spent countless hours tweaking their four available macro controls – Color, Shape, Sweep, and Contour. Turning one of these knobs changes several, under-the-hood, parameters at once, allowing the machines to be tweaked both effortlessly and immensely.