Roland JX-3P Polyphonic Synthesizer
Someone recently suggested that I look into possibly making some additions to the JX-3P firmware. Since the Organix/River and Kiwi-3P mods had already been done, I wanted to be sure I could offer something different before proceeding. Here is the result:
New firmware for the JX-3P:
With the help of several JX-3P owners, I have developed an enhanced version of the v4 firmware. The code requires using a larger (27128 or 27256) EPROM, and adding a wire to connect an additional address line to the CPU. The Memory Protect switch must also be modified to not protect in the MIDI position.
Here are the new features:
1) MIDI CC (7-bit) control of all patch parameters
2) Velocity of MIDI notes can modulate either VCF envelope depth, VCA
level, or both. Setting saved in patch. (Velocity
implementation based on MKS-30 code, not a special mode like the
"velocity EPROM" which Roland offered for the JX-3P.
Internal keys use velocity value of 64.)
6) LFO delay timer works when playing using MIDI, same as internal keybed
Note: The JX-3P hardware does
not support receiving data from the PG-200 and MIDI at the same time.
One or the other can be used, but not both. This is a
Here is a document which contains parameter CC numbers and information about the other new features.
Installing the new firmware requires performing two modifications to the JX-3P hardware. Here are the instructions for doing this.
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