This dialog generates rhythms from some kind of statistical specification. You define probabilties for timing, velocity and note-length and from these the rhythm is generated.
The three sliders you specify the meter and (with # Bars) how many probabilities you want to define. Next, you can add or remove instruments to the listbox. Then you specify the probabilities for rhythm, velocity and length for each instrument. Probabilities are set with the mouse where
In the rhythm field you specify the probabilities for every time position. A high value means a high probability that the instrument is played at that time. The velocity (and length) values are looked up by the generator, whenever it decides to play a beat. It chooses one value from 1..127 (x-axis, 1..8 for length) where positions with high probabilities are choosen more often.
If the choosen length is greater than 1 step, there are no more events generated until the note quits, even if there are high probabilities in the rhythm field. You can abuse this, to make shure that there are not too many events generated (example: you have rhythm probabilities at step 4 and 5, but you want exactly one beat to be played at either of these. Specifying a length of 2 will do this, if step 4 is choosen, there cannot be an event on step 5).
Aside from drums there are some special 'Instruments' you can select:
To generate, you select some bars on one track in the trackwin and press the gen button.