One other thing, since I noticed you in another thread talking about having a bunch of hardware connected to your Arduino:
Most likely, when using this software synthesizer, you will find that you can't do anything else while it is running; in other words, it likely takes up a lot of CPU cycles, while also consuming a big chunk of memory.
In other words, it turns an ATMega into something like the SpeakJet (which, IIRC, is simply another software synthesizer running on a custom programmed PIC).
