images via this auction."For about ten years, Roland Corporation and other manufacturers produced a range of unique, very high quality 24-pin guitar synthesizer controllers. With the advent of the contemporary Roland 13-pin standard, vintage guitar synth owners could only access the latest in guitar synthesizer technologies with the incredibly rare, hard-to-find Roland BC-13 Bus Converter.
The BX-13 V3 is the answer for vintage guitar synthesizer players who want to access modern guitar synthesizer technology while playing their treasured vintage guitar synth controller. The BX-13 V3 is more affordable than the typical "collector" prices on the Roland BC-13, and it has more features.
This diagram shows how the Roland BC-13 uses the Resonance knob to switch guitar and synth on and off. The BC-13 uses the Resonance Knob (CV#2) in a way that is very similar to the Mode switch on the vintage GR-series guitar. But rather than having a three-position switch, the knob has three "zones." The first zone is guitar only, the middle zone is guitar and synth, and last zone is synth only. Confusing? Yes.As you can imagine, it is almost impossible to quickly and accurately turn guitar and synth signals on and off.
The BX-13 V3 improves on the BC-13 by adding two dedicated foot switches with LEDs instead of using the Resonance knob. One foot switch is for Synthesizer Output, and one is for Guitar Output. Nothing could be simpler for controlling the outputs of your Synth and Guitar signal. In addition, the BX-13 V3 in enclosed in a rugged, stomp-box type enclosure. The BC-13 is an inline design, basically a giant lump in the middle of your guitar cable, much like the AC transformers popular with some manufacturers.
Top Panel Controls
The BX-13 V3 adds top panel controls for synthesizer and direct (humbucker) guitar output, plus a switch to select from guitar or hex fuzz sound for Roland G-202, G-303, G-505, or G-808 players. All three outputs can be accessed by selecting the hex fuzz sound with the BX-13 V3 and using the 1/4” Guitar output jack on the guitar.
A look at the schematics of various Roland guitar controllers reveals that no two are wired exactly the same. Likewise, the internal circuitry of a Roland GI-10, GI-20 and GR-20 differs with each unit. As a result, maximum volume levels can change with different guitars or different synthesizers. The original BX-13 used a "one-size-fits-all" calibration like the BC-13. Now, the BX-13 V3 adds a top panel control to easily fine-tune to synth volume output for maximum sensitivity and maximum output.
The BX-13 V3 also adds a top panel control for the direct (humbucker) output of the guitar as well. With the original Roland BC-13 and BX-13 this volume was fixed. Also, if you are using a Roland G-202, G-303, G-505, or G-808 you can also select the hex fuzz guitar output instead of the direct (humbucker) output. And, by plugging a Roland EV-5 volume pedal into the BX-13 V3 you can control the volume of the direct (humbucker) or hex fuzz output.
Buffered Electronic Connections:
The early Roland Guitar synth controllers, such as the G-202, G-303, G-505 and G-808, do not buffer the output of their volume controls. Later guitars, like the Roland G-707 and the Ibanez IMG2010, added a buffer stage to their volume controls. As a result, early guitars tend to "load" the input to the Roland BC-13, resulting in only 80 to 90 percent of the full volume output.
The BX-13 V3 solves this problem by adding an electronic buffer stage for the volume signal. The electronic buffer stage isolates the volume control signal so that any vintage guitar works smoothly with any modern guitar synthesizer.
Inputs and OutputsLike a Roland BC-13, the BX-13 V3 has a 24-pin Guitar Synth a 13-pin Guitar Synth output connector. With only the 24-pin cable plugged in, the level of the direct (humbucker) guitar sound is controlled by the top panel guitar volume knob, and by the optional EV-5 volume pedal. If you want to vary the level of the direct (humbucker) sound using the volume knob on the guitar, then a second cable is connected from the 1/4” Guitar output jack on the Guitar Controller to your mixer or amplifier.
Compatible with Vintage Bass Guitar Synthesizers:
The BX-13 V3 has also been thoroughly tested with the vintage Roland bass guitar synthesizer controllers like the G-88. To test for compatibility, the G-88 was plugged into the BX-13 V3, then the BX-13 V3 was connected to a GI-20. The Roland GI-20 supports bass guitar synths with a switch on the back panel for bass operation.
Other Roland guitar synths, such as the GR-50 may not work properly, since they were not designed to handle to lower frequencies of a bass guitar.
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