DigiTech GFX-1 Implementation Manual

TABLE OF CONTENTS

- General Digitech Midi Implementation

- GSP256

- GSP256XL

- GSP21/GSP21 PRO

- GSP7

- GFX1 (Twin Tube)

- MEQ Series

- IPS33B

DigiTechTM Midi Implementation Manual

June 2, 1991 - First Revision

Dod Electronics Corporation

8760 S. Sandy Parkway

Sandy, Utah 84070

Telephone (801) 266-8800

FAX (801) 266-7005

=============================================================

Preface

Before reading the DigiTech Midi Implementation Manual you should have a

w

orking knowledge of the MIDI 1.0 Detailed Specification which may be

obtained from the Midi Manufacturers Association1. Upon request DigiTech

w

ill provide information regarding their system exclusive commands for all

of their devices. Though we try to provide accurate documentation for our

devices to our customers we do not guarantee 100% correctness. Should you

discover some discrepancies between this manual and the actual device

implementation, please feel free to let us know about it. Please backup your

device's programs before making modifications through midi. Not only is this

a good practice, but it will save you a lot of down time should your midi

commands be incorrect. DigiTech does not assume any responsibility for lost

presets. Please note that the Midi Device Manual is a generic term used in

this document to refer to a device specific Midi Manual. (Example: GSP7 Midi

Implementation Manual)

Midi Channel

A

ll DigiTech devices can be configured to listen to midi on unique channels.

A

ll devices allow a selection of midi channels 1 through 16. Some devices

allow a channel selection of OMNI (receive midi on all channels), and some

devices allow the receipt of midi data to be disabled. Some devices allow

you to select one channel for the reception of midi data, and another

channel for the transmission of midi data. Check the Midi Device Manual for

information on how to select the midi channel for your device.

Program Change

A

ll DigiTech devices recognize a program change command. If the receive midi

channel is the same as the channel that the program change was transmitted

on, and the new program number is legal, the DigiTech device will change to

the new program number. Midi sends program changes 0 through 127. DigiTech

numbers their programs starting at 1. Thus midi program change 0 will map to

DigiTech device program 1. Some DigiTech devices allow you to remap program

changes. Remapping program changes allows the user to select any device

program based on the midi program change. The remapping of transmitted

program changes is available on devices that can generate program change

commands. Check the Midi Device Manual to determine if your device allows

the remapping of program changes.

Continuous Controllers

A

continuous controller may be associated with a device parameter. This

association is done by linking the controller to the parameter. DigiTech

uses the continuous controller to represent a percentage of the parameters

m

aximum value. Though this is the general principle, the exact formula for

each device can be found in the Midi Device Manual.

Channel Pressure

DigiTech treats channel pressure as a special case continuous controller.

System Exclusive

GENERAL FORMAT

D7 - D0 Hex Value Definition

11110000b F0h System exclusive status byte

00000000b 00h

00000000b 00h DOD/DigiTech manufacturer's ID number

00010000b 10h

0000nnnnb 0Nh N = Channel # - 1,

i.e. 0000 00h is Channel 1.

0001 01h is Channel 2

.

1111 0Fh is Channel 16

The internal representation of the channel to which the receiving unit is

listening. It is used to communicate with different units of the same device

type connected to a common MIDI line. If the receiving device is set to omni

then this byte is ignored.

0tttttttb TTh DigiTech device type. Specifies the particular DigiTech

product with which communication is being held. (See page 4 for current

DigiTech device types.)

0pppppppb PPh Procedure number. Each procedure's name and general format are

on page 4. Consult the Midi Device Manual to determine which procedures are

supported by your device and the exact data format for those procedures.

0dddddddb DDh

. .

. . Data as needed by procedures. Consult the Midi Device Manual to

determine the data format for each procedure.

. .

0dddddddb DDh

11110111b F7h End-of-Exclusive status byte

Current DigiTech Device Types

DigiTech Device Name Device Type Number

DSP 128 00000001b 01h

IPS 33 00000010b 02h

DSP 128 Plus 00000011b 03h

GSP 5 00000100b 04h

MSP 4 00000101b 05h

DSP 256 00000110b 06h

MEQ 28 00000111b 07h

MEQ 14 00001000b 08h

MEQ 7 00001001b 09h

GSP 21 00001010b 0Ah

GSP 21 PRO 00001010b 0Ah2

IPS 33B 00001010b 0Ah3

DSP 256 XL 00001011b 0Bh

GFX-1 (TWIN TUBE) 00001100b 0Ch

GSP 7 00001101b 0Dh

RP-1 00010000b 10h

Reserved 32 to 47 For IVL (20h-2fh)

VHM5 32 IVL Product

Vocalist II 33 IVL Product

TSR-24 64 (40H)

GSP-2101 65 (41H)

TSR-12 66 (42H)

RP-10 67 (43H)

LEGEND II 68 (44H)

TSR-6 69 (45H)

Reserved 50h to 5Fh For Audio Logic

BROADCAST 7Fh, used to send a message to

m

ultiple devices

DigiTech Procedures

In the following section SYSX_HEADER refers to a valid system exclusive

header. The system exclusive header starts with the System Exclusive status

byte, and includes all bytes through the DigiTech device type. EOX refers to

the End of System Exclusive status byte (F7h). All numbers in the format

definition of each procedure are given as hexadecimal values.

REQUEST CONFIGURATION (00000000b 00h)

SYSX_HEADER 00h EOX

SYSX_HEADER 00h 00h EOX (For IPS 33B only)

When a REQUEST CONFIGURATION procedure is received, the DigiTech device will

respond with a RECEIVE CONFIGURATION procedure.

REQUEST ONE PROGRAM (00000001b 01h)

SYSX_HEADER 01h yy zz EOX

SYSX_HEADER 01h zz EOX (For IPS 33B only)

yy 0000000vb where v is bit 7 of the requested program number - 1.

zz 0vvvvvvvb where v is bits 6 through 0 of the requested program number -

1.

When a REQUEST ONE PROGRAM procedure is received, the DigiTech device will

respond with a RECEIVE ONE PROGRAM procedure.

REQUEST ALL HARMONY DEFINITIONS (00000010b 02h)

SYSX_HEADER 02h 00h EOX

When a REQUEST ALL HARMONY DEFINITIONS procedure is received, the DigiTech

device will respond with a RECEIVE ALL HARMONY DEFINITIONS procedure.

REQUEST ONE HARMONY DEFINITION (00000011b 03h)

SYSX_HEADER 03h zz EOX

zz 0vvvvvvvb where v is bits 6 through 0 of the requested harmony definition

- 1.

When a REQUEST ONE HARMONY DEFINITION procedure is received, the DigiTech

device will respond with a RECEIVE ONE HARMONY DEFINITION procedure.

REQUEST ALL ARPEGGIO PATTERN DEFINITIONS (00000100b 04h)

SYSX_HEADER 04h 00h EOX

When a REQUEST ALL ARPEGGIO PATTERN DEFINITIONS procedure is received, the

DigiTech device will respond with a RECEIVE ALL ARPEGGIO PATTERN DEFINITIONS

procedure.

REQUEST ONE ARPEGGIO PATTERN DEFINITION (00000101b 05h)

SYSX_HEADER 05h zz EOX

zz 0vvvvvvvb where v is bits 6 through 0 of the requested arpeggio pattern

definition - 1.

When a REQUEST ONE ARPEGGIO PATTERN DEFINITION procedure is received, the

DigiTech device will respond with a RECEIVE ONE ARPEGGIO PATTERN DEFINITION

procedure.

REQUEST RAM AREA (00000110b 06h)

SYSX_HEADER 06h bb ww xx yy zz nn EOX

bb Bank number of ram being requested. Currently the only valid bank in

DigiTech devices is 00h.

w

w 0000000vb where v is bit 15 of the ram address.

xx 0vvvvvvvb where v is bits 14 - 8 of the ram address.

yy 0000000vb where v is bit 7 of the ram address.

zz 0vvvvvvvb where v is bits 6 - 0 of the ram address.

nn 1 to 7Fh, the number of ram bytes to be sent.

The REQUEST RAM AREA procedure is used to have the DigiTech device send an

area of its internal ram to a host midi device. When a REQUEST RAM AREA

procedure is received, the DigiTech device will respond with a DATA RESPONSE

procedure. The Midi Device Manuals for the DigiTech devices which support

the REQUEST RAM AREA procedure contain a memory map and definition of the

ram locations which may be requested.

DATA RESPONSE (00010000b 10h)

SYSX_HEADER 10h bb ww xx yy zz nn d(1) d(1)'...d(nn) d(nn)' EOX

bb Bank number of ram being sent. Currently the only valid bank in DigiTech

devices is 00h.

w

w 0000000vb where v is bit 15 of the ram address.

xx 0vvvvvvvb where v is bits 14 - 8 of the ram address.

yy 0000000vb where v is bit 7 of the ram address.

zz 0vvvvvvvb where v is bits 6 - 0 of the ram address.

nn 1 to 7Fh, the number of ram bytes in this response.

d(c) 0000000vb where v is bit 7 of the cth byte being sent.

d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte being sent.

The DATA RESPONSE procedure is sent from a DigiTech device in response to a

REQUEST RAM AREA procedure. If a DATA RESPONSE procedure is received by a

DigiTech device, it is ignored. The Midi Device Manuals for the DigiTech

devices which send the DATA RESPONSE procedure contain a memory map and

definition of the ram locations which may be sent in response to a REQUEST

RAM AREA procedure.

RESET DEVICE (00100000b 20h)

SYSX_HEADER 20h EOX

The RESET DEVICE procedure causes the DigiTech device to reset itself as

though the power had just been turned on.

RESET HARDWARE (00100001b 21h)

SYSX_HEADER 21h EOX

The RESET HARDWARE procedure causes the DigiTech device to reload all of

it's hardware devices.

RESET HARDWARE DEVICE (00100010b 22h)

SYSX_HEADER 22h aa bb EOX

aa The major number of the device to be reset.

bb The minor number of the device to be reset.

The RESET HARDWARE DEVICE procedure causes the DigiTech device to reload a

particular hardware device. The major number is used to identify the

hardware device. The minor number is used to identify a particular element

of a hardware device. If the minor number is 0, then all elements of the

device are reset. As an example, the speaker simulator on the GFX-1

(TwinTube) has a major device number of 2. Valid minor numbers for the

speaker simulator are 0 through 6. If the minor number is 0, then all bands

of the speaker simulator are reset. If the minor number is 1, then the first

band of the speaker simulator is reset. 2 would reset the second band, etc.

RECEIVE MICROCODE (01000000b 40h)

SYSX_HEADER 40h aa bb cc dd ... EOX

aa

bb Repeated groups of 4 bytes.

cc

dd

The RECEIVE MICROCODE procedure is used by DigiTech for product development.

RECEIVE CONFIGURATION (01000001b 41h)

SYSX_HEADER 41h d(1) d(1)' ... d(n) d(n)' EOX

SYSX_HEADER 41h d(1)' ... d(n)' EOX (For IPS 33 only)

SYSX_HEADER 41h 00h d(1)' ... d(n)' EOX (For IPS 33B only)

d(c) 0000000vb where v is bit 7 of the cth byte of the configuration.

d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the

configuration.

The RECEIVE CONFIGURATION procedure is used to load configuration

information into the DigiTech device. The number of configuration bytes to

be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

DSP128 1,572 3,144

IPS33 396 396

DSP128 Plus 1,587 3,174

GSP5 2,291 4,582

DSP256 5,718 11,436

MEQ 28 3,511 7,022

MEQ 14 3,511 7,022

MEQ 7 3,511 7,022

GSP21 5,401 10,802

GSP21 PRO 5,401 10,802

IPS33B 9,088 9,088

DSP256 XL 5,744 11,488

GFX-1 TWIN TUBE 6,295 12,590

GSP7 5,088 10,176

RECEIVE ONE PROGRAM (01000010b 42h)

SYSX_HEADER 42h yy zz d(1) d(1)' ... d(n) d(n)' EOX

SYSX_HEADER 42h zz d(1)' ... d(n)' EOX (For IPS 33B only)

yy 0000000vb where v is bit 7 of the received program number - 1.

zz 0vvvvvvvb where v is bits 6 through 0 of the received

program number - 1.

d(c) 0000000vb where v is bit 7 of the cth byte of the received program.

d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the received

program.

The RECEIVE ONE PROGRAM procedure is used to load a program into the

DigiTech device. The number of program bytes to be received (n) is different

for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33 4 4

DSP256 38 76

MEQ 28 35 70

MEQ 14 35 70

MEQ 7 35 70

GSP21 61 122

GSP21 PRO 61 122

IPS33B 71 71

DSP256 XL 38 76

GFX-1 TWIN TUBE 49 98

GSP7 52 104

RECEIVE ALL HARMONY DEFINITIONS (01000011b 43h)

SYSX_HEADER 43h 00h d(1) ... d(n) EOX

d(c) 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the harmony

definitions.

The RECEIVE ALL HARMONY DEFINITIONS procedure is used to load all harmony

definitions into the DigiTech device. The number of harmony definition bytes

to be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33 384 384

IPS33B 768 768

RECEIVE ONE HARMONY DEFINITION (01000100b 44h)

SYSX_HEADER 44h 00h zz d(1) ... d(n) EOX

zz 0vvvvvvvb where v is bits 6 through 0 of the received harmony definition

number - 1.

d(c) 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the harmony

definition.

The RECEIVE ONE HARMONY DEFINITION procedure is used to load one harmony

definition into the DigiTech device. The number of harmony definition bytes

to be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33 24 24

IPS33B 24 24

RECEIVE ALL ARPEGGIO PATTERN DEFINITIONS (01000101b 45h)

SYSX_HEADER 45h 00h d(1) ... d(n) EOX

d(c) 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the arpeggio

pattern definitions.

The RECEIVE ALL ARPEGGIO DEFINITIONS procedure is used to load all arpeggio

pattern definitions into the DigiTech device. The number of arpeggio pattern

definition bytes to be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33B 544 544

RECEIVE ONE ARPEGGIO PATTERN DEFINITION (01000110b 46h)

SYSX_HEADER 46h 00h zz d(1) ... d(n) EOX

zz 0vvvvvvvb where v is bits 6 through 0 of the received arpeggio pattern

definition number - 1.

d(c) 0vvvvvvvb where v is bits 6 through 0 of the cth byte of the arpeggio

pattern definition.

The RECEIVE ONE ARPEGGIO DEFINITION procedure is used to load one arpeggio

pattern definition into the DigiTech device. The number of arpeggio pattern

definition bytes to be received (n) is different for each DigiTech device.

DigiTech Device # Ram bytes # Midi data bytes

IPS33B 17 17

RECEIVE RAM AREA (01000111b 47h)

SYSX_HEADER 47h bb ww xx yy zz nn d(1) d(1)'...d(nn) d(nn)' EOX

bb Bank number of ram being received. Currently the only valid bank in

DigiTech devices is 00h.

w

w 0000000vb where v is bit 15 of the ram address.

xx 0vvvvvvvb where v is bits 14 - 8 of the ram address.

yy 0000000vb where v is bit 7 of the ram address.

zz 0vvvvvvvb where v is bits 6 - 0 of the ram address.

nn 1 to 7Fh, the number of ram bytes being received.

d(c) 0000000vb where v is bit 7 of the cth byte being received.

d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte being sent.

The RECEIVE RAM AREA procedure is used to load an area of a DigiTech

device's internal ram from a host midi device. The Midi Device Manuals for

the DigiTech devices which support the RECEIVE RAM AREA procedure contain a

m

emory map and definition of the ram locations which may be received.

RECEIVE LARGE RAM AREA (01001000b 48h)

SYSX_HEADER 48h bb ww xx yy zz nn1 nn2 nn3 d(1) d(1)'...d(nn) d(nn)' EOX

bb Bank number of ram being received. Currently the only valid bank in

DigiTech devices is 00h.

w

w 0000000vb where v is bit 15 of the ram address.

xx 0vvvvvvvb where v is bits 14 - 8 of the ram address.

yy 0000000vb where v is bit 7 of the ram address.

zz 0vvvvvvvb where v is bits 6 - 0 of the ram address.

nn1 0vvvvvvvb where v is bits 6 - 0 of the transfer count.

nn2 0vvvvvvvb where v is bits 13 - 7 of the transfer count.

nn3 0vvvvvvvb where v is bits 20 - 14 of the transfer count.

d(c) 0000000vb where v is bit 7 of the cth byte being received.

d(c)' 0vvvvvvvb where v is bits 6 through 0 of the cth byte being sent.

The RECEIVE LARGE RAM AREA procedure is used to load an area of a DigiTech

device's internal ram from a host midi device. The Midi Device Manuals for

the DigiTech devices which support the RECEIVE RAM AREA procedure contain a

m

emory map and definition of the ram locations which may be received.

REQUEST BULK DUMP (01001001b 49h)

SYSX_HEADER 49h EOX

When a REQUEST BULK DUMP procedure is received, the DigiTech device will

respond with a RECEIVE LARGE RAM AREA procedure.

RETURN TO PROGRAM SCREEN (0110000 b 60h)

SYSX_HEADER 60h EOX

When a RETURN TO PROGRAM SCREEN procedure is received, the DigiTech device

w

ill return to the program screen if it is on an algorithm or parameter

screen.

notes:

1 MIDI Manufacturers Association

5316 W. 57th St.

Los Angeles, California 90056

(213) 649-6434

2 The midi specifications for the GSP21 and the GSP21 PRO are identical.

3 The GSP 21's and the IPS 33B's midi data format IS NOT IDENTICAL (but

their MIDI IDs are). Therefore, the GSP 21's and GSP 21 PRO's midi receive

channel must be different than the IPS 33B's midi receive channel if they

are to both be on the same midi system.

=============================================================

DSP256 Midi Implementation

Device type for the DSP256

Device Type = 6 (06h)

DigiTech Procedures recognized by the DSP256

Request Configuration (00h)

Request One Program (01h)

Receive Microcode (40h)

Receive Configuration (41h)

Receive One Program (42h)

Continuous Controller Calculations

Parameter Value = (CC_Value * 2 * (PARAM_MAX + 1))/256

CC_VALUE The value of the continuous controller. (0-127)

PARAM_MAX The maximum value of the parameter the continuous controller is

changing.

Data format for the DSP256 Receive Configuration procedure

Please note that each internal ram byte (d7 - d0) is transmitted as 2 midi

bytes. The first midi byte is 0000000xb where x is d7. The second midi byte

is 0xxxxxxxb where x is d6 - d0. Refer to the Receive Configuration

procedure in the General Midi Implementation Manual for required header

information.

Ram Byte Number Quick Definition

1 - 2048 128 Program names

2049 - 4864 128 Program definitions

4865 - 5458 27 Algorithm definitions

5459 Program number

5460 Midi receive channel

5461 - 5553 Global link table of parameters to continuous controllers

5554 - 5681 Translation table of received midi program number to

DSP256 program number

5682 Send program change flag

5683 Hand controller flag

5684 - 5700 Foot switch function table

5701 - 5717 Foot switch program table

5718 LCD contrast value

Total Number of Internal Ram Bytes Transmitted 5718

Data format for the DSP256 Receive One Program procedure

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