 The JD-800 has 108 waveforms built-in, but these can be expanded via PCM-cards.There are waveforms in a variety of categories, like; analog synth, acoustic instruments, like guitars, woodwind, brass and voices.Most of these waveforms are very short and are designed to give character to the attack portion of a sound, while some longer ones are designed for creating pads, or the sustained part of a patch.