Appendices Transmit Data, Channel Mode Message

Chapter 5 Appendices

3. Transmit Data

The following are messages transmitted from the USB and MIDI connectors (when MIDI PLAYBACK is OFF).

When MIDI PLAYBACK is OFF, identical messages are transmitted by USB and MIDI. When MIDI PLAYBACK is ON, messages transmitted from the computer to the GI-20’s USB are sent through to MIDI OUT.

Refer to “Signal Flow” (p. 8).

■Channel Voice Messages

❍Note Off

Status	2nd byte	3rd byte
9nH	kkH	00H
n=MIDI channel number:		0H - FH (0 - 15)	0=ch.1 15=ch.16
kk= Note number:		00H - 7FH (0 - 127)
❍Note On
Status	2nd byte	3rd byte
9nH	kkH	vvH
n=MIDI channel number:		0H - FH (0 - 15)	0=ch.1 15=ch.16
kk= Note number :		00H - 7FH (0 - 127)
vv= Velocity:		01H - 7FH (1 - 127)

●Control Change

Control Changes (1–95) other than those for Bank Select, Data Entry, and general purpose controllers 3–8 received through the control channel, the channels are converted and messages are transmitted as shown below.

Control Changes assigned to the expression pedal, foot switch, and GK Volume are also transmitted over the channels shown below.

In MONO mode:	the six channels starting with the basic channel
In POLY mode:	only the basic channel

❍Bank Select

Status	2nd byte	3rd byte
BnH	00H	mmH
BnH	20H	llH
n=MIDI channel number:		0H - FH (0 - 15) 0=ch.1 15=ch.16
mm,ll= Bank number:		00 00H - 7F 7FH (bank 1 - bank 16384)

*Transmitted when the power to the GI-20 is turned on, when editing Bank Select, and when patches are switched.

*Not transmitted when the patch parameter’s Bank Select Switch is set to OFF or when the system parameter PC MASK is set to ON.

❍Data Entry

Status	2nd byte	3rd byte
BnH	06H	mmH
BnH	26H	llH
n=MIDI channel number:		0H - FH (0 - 15) 0=ch.1 15=ch.16

mm,ll=the value of the parameter specified by RPN

❍RPN MSB/LSB

Status	2nd byte	3rd byte
BnH	65H	mmH
BnH	64H	llH
n=MIDI channel number:		0H - FH (0 - 15) 0=ch.1 15=ch.16

mm=Upper byte of the parameter data designated by RPN ll=Lower byte of the parameter data designated by RPN

<<< RPN >>>

Control change includes RPN (registered parameter number), function which are defined by the MIDI standard. The GI-20 can transmit only RPN: pitch bend sensitivity (RPN#0) and channel fine tuning (RPN#1).

RPN	Data entry
MSB LSB	MSB LSB	Notes
00H 00H	mmH 00H	Pitch Bend Sensitivity
		mm:00H - 18H (0 - 24 semitone)
		LSB always transmits 00H.
		* Transmitted when the power to the GI-20 is
		turned on, when the BEND RANGE
		parameters are edited, and when patch
		changes are transmitted.
00H 01H	mmH llH	Channel Fine Tuning
		mm,ll: 20 00H - 40 00H - 60 00H
		(-4096 x 100 / 8192 - 0 - +4096 x 100 / 8192 cent)
		* Transmitted when the power to the GI-20 is
		turned on, when the basic pitch is edited, and
		when patch changes are transmitted.

●Program Change

Status	2nd byte
CnH	ppH
n=MIDI channel number:		0H - FH (0 - 15) 0=ch.1 15=ch.16
pp= Program number:		00H - 7FH (0 - 127) 0=prg.1 127=prg.128

*Transmitted when the power to the GI-20 is turned on, when Program Changes are edited, and when patch changes are transmitted.

*Not transmitted when the patch parameter’s Program Change Switch is set to OFF or when the system parameter PC MASK is set to ON.

●Pitch Bend Change

Status	2nd byte	3rd byte
EnH	llH	mmH
n= MIDI channel number:		0H - FH (0 - 15) 0=ch.1 15=ch.16
mm,ll= Value:		00H, 00H - 7FH, 7FH (-8192 - +8191)

■Channel Mode Message

●Reset All Controller

Status	2nd bye	3rd byte
BnH	79H	00H
n = MIDI Channel number:		0H - FH (0 - 15) 0=ch.1 15=ch.16

*Transmitted when the MIDI PLAYBACK is switched, when the Bulk mode is selected, and when the parameter is edited.

■System Realtime Message

●Active Sensing

Status

FEH

*This message is always transmitted at about 250 msec intervals.

■System Exclusive Message

Status	Data byte	Status
F0H	iiH,ddH,.....,eeH	F7H
F0H:	System Exclusive
ii=ID number:	41H (65)
dd,...,ee=Data:	00H-7FH (0-127)
F7H:	EOX (End of Exclusive/System common)

*For more details, refer to the page “Roland exclusive message” and Section 4 or after.

GI-20 specifications

The Roland GI-20 is a groundbreaking MIDI guitar converter that allows electric guitarists to explore the vast world of MIDI technology. Designed to bridge the gap between traditional guitar playing and digital music production, the GI-20 transforms standard guitar signals into MIDI data, giving players access to a wide array of synthesized sounds and virtual instruments.

One of the main features of the GI-20 is its ability to track the guitar’s pitch with high accuracy. Utilizing Roland’s advanced technology, the device boasts rapid response times and minimal latency, ensuring that every note plucked or strummed is translated into MIDI in real-time. This precision is crucial for guitarists who wish to maintain their playing style while experimenting with synthesizers and sampled instruments.

In terms of connectivity, the Roland GI-20 is equipped with a 13-pin connector, allowing it to interface seamlessly with compatible Roland synths, sound modules, and other MIDI devices. Additionally, standard MIDI outputs enable connection to MIDI controllers and computers, providing an expansive toolkit for music creation.

The user interface is designed with simplicity in mind. A large LCD display allows for easy navigation of settings, while intuitive controls help players adjust parameters on the fly. Guitarists can also customize their performance by altering the sensitivity levels, enabling them to fine-tune how the device responds to their playing style.

The GI-20 offers an array of built-in sounds that mirror the capabilities of traditional synthesizers. These sounds can be layered or split into different tones based on the player’s preferences, offering a variety of sonic textures to enhance compositions. Furthermore, the ability to save and recall user settings allows for quick access to preferred configurations during live performances.

Another significant characteristic of the GI-20 is its compatibility with a wide range of guitars, including both electric and bass guitars. As long as the instrument is equipped with the appropriate pickup system, the GI-20 can effectively convert its output into MIDI signals.

In summary, the Roland GI-20 is a versatile and innovative tool for guitarists seeking to expand their creative horizons. With its accurate tracking, extensive connectivity, user-friendly interface, and a wealth of sounds, it unlocks the potential for guitarists to dive into the realms of electronic music and MIDI composition. Whether in the studio or on stage, the GI-20 opens up a world of possibilities for musicians looking to blend traditional guitar playing with modern technology.

Roland GI-20 owner manual Appendices Transmit Data, Channel Mode Message, System Realtime Message

Models: GI-20