Roland JX-305 GrooveSynth

Roland JX-305 Image

The JX-305 is an awesome synth for electronic & techno musicians! It's like an MC-505 groovebox in a keyboard. All of the MC-505's excellent dance-oriented sounds are included, as well as 4MB more! Combining keyboard style patch synthesis & performance with Groove Approved dance patterns, sequences and phrases the JX-305 is a real dance production studio with 768 dance patterns, 256 User, 640 patches and 28 drum kits.

Perfect for live use with its massive 64 voices of polyphony, you can jam along with it while it's instantly playing a great techno/dance groove! Then grab anyone of the 9 real-time control knobs to start tweaking the filter, envelope, tempo, arpeggiator or LFO. All real-time edits, pattern changes, tweaks and keyboard playing can be recorded into its 8-track sequencer - a robust sequencer with quantizing and edit capabilities! If your bag is dance, trance and rave then this Groovesynth may be all you need! It has been used by Astral.

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45 Visitor comments
March 23, 2013 @ 5:02 pm
If this has the same soundset as the mc303 then it sounds like crap. Might make a good midi controller though...
February 26, 2013 @ 12:36 am

Keyboards like this don't have hammers like you would find in a piano. Most likely, the spring which pulls the key back up has come off or has broken. There's a reasonably good chance that it came off because the end of the key broke. Most keyboards are easy enough to open up. Set the keyboard upside down on your bed, get a bowl for screws, your camera so you remember where things go (and how internal plugs are oriented -- take a lot of photos) and a good screwdriver. Typically the screws are on the bottom, and sometimes you need to take off side panels.
February 19, 2013 @ 10:09 am
This was one of my greatest synths! I felt in love with it a soon as I saw it the first time. An absolutely cool device! Designers of the 90es seem to have been the best. Nowadays Synthesizers are mostly plastic crap. This 305 was the grooviest ever :-)

Advice to the user below: Unplug the keyboard and use a external balanced master keyboard. Knobs and Controllers will work though.
Samuel Coronado
February 10, 2013 @ 10:28 am
ive had my jx-305 for 13 years now and one of the black keys stay down. so im guessing the hammer is broken. Anyone have special inttructions on how to repair it. i assume i will have to order a part but i do not want to send it in for repair. i would like to do it myself. any help would be great. thanks.

November 3, 2012 @ 5:23 pm
Octave One has used this.
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User Rating

Rated 4.6 (1126 Votes)

  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Polyphony - 64 Voices
  • Effects - 24 effects including reverb, delay, chorus, etc...
  • Memory - 640 patches, 28 rhythm kits
  • Patterns - 768 Dance patterns, 256 User
  • Filter - Digital real-time & midi controllable resonant low/band pass filter
  • Arpeg/Seq - 8-Track sequencer, Arpeggiator and real-time Phrase Sequencer
  • Keyboard - 61 notes (w/ velocity)
  • Control - MIDI
  • Date Produced - 1998
  • Resources & Credits
  • Images from Synthesizer Picture Gallery (site gone).

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