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Manufacturer: Ketron


The KETRON SD4 is a pocket size sound module designed for all PC and MIDI applications. Equipped with a new powerful sound engine, including a professional Stereo Grand Piano sound with over 88 notes, huge Orchestral voices such as Saxophones, Brass, Woodwinds, Guitars, Accordions, Organ Digital Drawbars and many others, the SD4 has all the latest features for recording, programming and live performances.

The realism and sound quality of the Solo instrumental Voices on the KETRON SD4 are remarkable - but expected, following in the tradition of the  KETRON "Best Natural Sound" heritage.  In addition, the SD4 includes very distinctive Audio Drum and Percussion Loops selected from Slow, Jazz, Latin, Acoustic, Traditional and Dance backgrounds.

Used in conjunction with a Computer, Master keyboard, MIDI accordion or MIDI guitar, the SD4 offers an "all-in-one" great sound resource that ban be used to greatly enhance standard MIDI files, as well as for Home and Studio compositions and recordings.

Its MIDI capability allows one to control up to 32 MIDI channnels and includes DSP effects such as Reverb, Chorus, Delay and Distortion.

The SD4 can be directly connected to a mobile PC using a USB connection (without need of an separate power supply) or it can be used to interface with Master keyboards lacking in USB ports. The two input MIDI ports allow one to play very high quality sounds while at the same time having an independent MIDI file playing. The SD4 permits one to stack and edit all available tones to get new customized sounds, which can be easily saved and reloaded at any time. Editing these tones is even further simplified by using the special Ketron PC software (Available for download at no cost by visiting

Moreover, by the three potentiometers it is possible to change in real time the Midi file main parameters balancing the volume of the single tracks of the MIDI file or of the Preset sounds that are being used. A very useful function of "Intelligent Transposer" is available for MIDI file playback. This allows the key to be changed without altering the instrument's timbre.

Special configurations with the sound Map (Templates) are provided so the SD4 can easily work with the most commonly used sequencer programs such as Cubase, Logic, Cakewalk, Etc, as well as the complete SD4 Drum Loop Library.


Sound Generation Stereo Grand Piano. 512 Voices.
3 GM Banks + 1 Special Bank
64 Factory Preset Voices; 64 User Prest Voices
Drum 1 32 New Drum sets.
Drum 2 82 Drum Loops, featuring Acoustic, Latin, Jazz and Dance Loops.
Effects Multi effect DSP. Reverb, Chorus, Delay, Distortion, Rotor Slow/Fast.
Operation Mode Master Keyboard, Accordion, Organ, 2 x Midifile
General Functions Global Transpose, Keyboard transpose, Midifile Transpose, Intelligent Transpose, Fine tune, Keyboard Split, Midi Reset
Midifile Functions Volume, Program change, Solo, Lead voice On/Off
MIDI 2 Mifi In, 1 Midi Out (Soft Thru). 32 Midi Channels. GM standard.
USB Interface Yes
Outputs Stereo headphone. Stereo Output L/R
Display Alphanumeric 3 x 7 LED Segments
Tabs 24 inbut buttons. 0 – 9 Numeric select
Potentiometers Master Volume, Voice Volume, Midifile Volume
Dimensions L x W x H = 8.5 x 5 x 2.6 inches.  (21 x 12.5 x 6.5 cms.)
Weight 2 lbs ( 0.9 Kg)
Power External 9 Volts Power supply.

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