The HBP10GM MIDI synthesizer is a module for playing MIDI data from a sequencer (eg. MidiWorks) or MIDI-file player (eg. Monolith). To use the synthesizer with either of these (or with MelIDI), you'll need MIDI L4 and MIDISupport, but the synthesizer can also be used on its own - a program is included which will play MIDI-files without requiring MIDI L4 and MIDISupport. Notice that the synthesizer is still pretty much a beta-version, so not much documentation is included. Also, only a few samples are included - you'll need to find samples elsewhere. It includes a module (with source) which implements large parts of the MIDI module functionality. This allows applications like MidiWorks to play through the synthesizer without requiring MIDI L4 or MIDISupport!