Drummer has the following features:
Real-Time switching between up to eight patterns in a given style. Each pattern includes its own fill. Each style also has an intro and end pattern.
Innovative Hit Feature provides a way to accent any beat, allowing you to break free from the canned drum loop sound.
MIDI File Format uses standard marker messages to delimit patterns, allowing easy creation of custom styles with a MIDI sequencer!
External Control allows all of Drummer’s functions to be controlled via MIDI for live flexibility (converter box required).
The app has been in beta for quite a long time now so I do wonder when it will go to version 1.0. However, it is always good to see new music applications appearing for the palm platform, or for any mobile platform for that matter.