The CTK-900 makes it possible to produce very special sound creations - with 824 tones, 176 rhythms and 242 digital effects. The CTK-900 also has FLASH ROM to expand sounds, rhythms and to download songs from the internet, an a SMF Player to play the downloaded songs. It also includes a Internet Data Expansion System that lets you download new sounds, patterns, songs and keyboard settings over MIDI from the CASIO MUSIC SITE.
Features:

• 4MB Flash ROM
• 242 Digital Effects
• 176 Preset Rhythm Patterns
• Auto Accompaniment
• ZPI Sound Source
• Touch Sensitive with On/Off
• 176 One-Touch Presets
• 5 Songs, 6 Tracks Real-Time Recording
• Casio Chord
• Synthesizer Function
• Auto-Harmonize
• Digital Equalizer
• Drawbar Organ
• Split & Layer Function