Korg Pa4x keyboard profesional arrangger 
Keyboard
Pa4X 61: 61 keys (C2 – C7)
Pa4X 76: 76 keys (E1 – G7)
Semi–weighted keys with Velocity and Aftertouch
System
Upgradable Operating System
Multitasking, load while play feature
Sound Generator
EDS-X (Enhanced Definition Synthesis-eXpanded)  
Filters with Resonance - Three band EQ for each track
Polyphony
128 Voices, 128 Oscillators
Effects
Accompaniment/Song: 4 Insert Effects; 3 Master Effects (148 Types)
Keyboard Tracks: 1 Insert Effect; 2 Master Effects (148 Types)
 
Final Mastering Effects: Waves Audio Ltd. MAXX Suite (Includes MaxxEQ™, MaxxBass™, MaxxTreble™, MaxxStereo™, MaxxVolume™)
Voice Processor Technology by TC Helicon®
Four-part Harmonizer, Double, µMod, Reverb, Delay, Filter, HardTune, Pitch Correction;
plus Compressor, EQ, Gate (Adaptive Mic Setting on the Mic input)
Sounds / Drumkits
Factory:  More than 1,900 Factory Sounds including a new multilayer Stereo Piano with damper/body resonance, GM/XG sound sets and more than 110 Drumkits * including Ambient Drums
 
User Area:  512 Sounds, 256 Drumkits
Digital Drawbars:  9 Footages, Percussion, Key On/Off, Leakage (Effect section includes rotary speaker)
 
Defined Nuance Control (DNC) Technology
Natural Ambience Drums Sound
Full Sounds/Drumkits editing 
Sampling
User PCM RAM Memory: 400 MB
Load KORG, Wav, AIFF and SoundFont™ formats
Save KORG, Wav and AIFF formats
Full Edit, Time Slice, Sampling feature
Styles
Factory: More than 550 Factory Styles, freely reconfigurable sets
User: 1,248 locations, including User, Favorite and Direct banks
Eight Accompaniment tracks, 4 Keyboard Sets, 4 Pads per Style; Style Settings (Sounds and Arranger parameters) on each Style
Guitar Mode 2, Parallel and Fixed NTT (Note Transposition Table)
Style Record with Step Record, Track and Event Edit
MIDI Song to Style Converter
Style controls: 3 Intros, 4 Variations, 4 Fills, Break, 3 Endings, Synchro Start, Synchro Stop, Tap Tempo/Reset, Bass Inversion, Auto Fill, Manual Bass, Memory, Accompaniment Mute, Drum Mapping, Snare & Kick Designation, Style to KBD Set Mode
Chord Sequencer
Chord Sequence recorder in Style Play mode
Chord Sequences can be saved to Style and SongBook En-tries
Edit functions: delete, copy from Style/SongBook, import/export from/to SMF
Keyboard Set Library
Memorize keyboard Sounds settings
Factory: More than 460 Factory Keyboard Sets, freely recon-figurable
User: 1,056 locations, including User and Direct banks
“My Setting” special Keyboard Set
KAOSS FX
Automatic MIDI FX generator 
More than 65 Factory Presets
Song Play
Patented XDS Crossfade Dual Sequencer Player with X-Fader Balance control
Supported formats: MID, KAR, MP3 + lyrics, MP3+G
2 Players with separate Select, Start/Stop, Home, Rewind and Fast Forward controls
Lyrics, Score, and Chord data can be displayed on screen, or on external video monitor
Markers with Add, Delete, Edit and Loop functions
Jukebox function
MP3 Player / Recorder
Double MP3 Player and MP3 Recorder
Transpose (+6/-5 semitones) 
Tempo change (±30%)
Vocal Remover
Records MP3 files including Styles, MIDI Songs, MP3 Songs, Keyboard Sounds, Pads, Microphone, Effects, and KAOSS Effects 
Sequencer
Quick Record (Backing Sequence), Multitrack and Step Record functions -
Full-featured sequencer, 16 tracks, Up to 200,000 events, SMF (MID) native format
SongBook
Fully programmable music database based on Styles, MIDI Songs (MID and KAR files), MP3 Songs with automatic selection of Style Play and Song Play modes
User definable Set Lists, with Entries selectable from the control panel
Filtering and sorting options
Compatibility
"i-Series" models: Styles
Pa-Series models: Styles, Performances, Programs/Sounds, Songs, SongBook Entries, Pads
Pads
Four Assignable Pads + Stop Buttons
Pad Record function
General Controls
Master Volume; Fade In/Out; Keyboard-Acc/Song Balance Volume; Ensemble; Octave Transpose; Master Transpose; Quarter Tone and Arabic Scale memorized inside Keyboard Sets; Joystick (pitch + modulation); Ribbon; Mic Volume; Harmony/Double; Delay/Reverb; Mic Preset; Mic On/Off; Harmony On/Off; Double On/Off; 8 Assignable Sliders; Slider Mode; MP3 Volume; 3 Assignable Switches; Tempo +/-; Tempo Lock; Metronome On/Off; Dial; Up/+; Down/-; Search; Shift; Chord Scan (Lower, Upper); Split; Keyboard Tracks Sound Select and On/Off; Record
Control Inputs
Damper pedal (support half-pedaling with optional DS-1H pedal)
Assignable pedal/switch
EC5 multiswitch pedal
Mic/Line Inputs
Mic: Combo XLR balanced with Gain control and Phantom Power 
Line 1: Left/Right Jack (1/4") Line Input, balanced 
Line 2: Stereo Mini-jack (1/8") Line Input, unbalanced
Outputs
Audio Output: Left/Right, Out 1, Out 2; (1/4" Jack) balanced
Headphone Output x 1 ( 1/4" Jack)
Video Out (RCA connector)
MIDI
IN, OUT, THRU standard MIDI connectors
USB to MIDI using the USB Device port
8 user definable MIDI Setups
USB
Type A (HOST, for memory and controllers) x 2 (front/rear) 
Type B (DEVICE, for personal computers and tablets) x 1 (rear) 
2.0 Hi-Speed connections
Storage
Hard Drive:
 - Pa4X 76: Standard
 - Pa4X 61: optional, user installable; HDIK-3 hard disk installation kit required

Micro SD card: (Card not included)
 - Rear panel slot with plastic cover

USB Flash Drive: (Drive not included)
 - 1 Front panel port
 - 1 Rear panel port
Display
7” Wide capacitive color TouchView™ TFT display
Clock
Internal System Clock
AC -
Power Consumption
100-240 Volts, 50/60 Hz
0.5 Watt in standby / 16 Watt normal / 38 Watt with PaAS installed