Synthesizers
Generate large variety of musical sounds, including GM and non GM
Contain memory chips, DSPs, microprocessors, oscillators, A-D and D-A converters, mixers, audio circuitry etc
Contain sophisticated sound processing circuitry for reverb, chorus, distortion, other special effects
Can use supplied sounds or generate your own and store in memory
Polyphony usually between 32 and 64 tones
Sound quality much superior to sound cards, much more versatile
Usually small module or rack mounted unit
Software synthesizers becoming available with 128 tone polyphony
Large variety available from Yamaha, Roland, Casio, Korg, Kurtzweil
Recommended Roland JV1080, JV880, SC-55/88 Sound Canvas
Price range between $500 and $2000