Yamaha DX7mega128 Manuel utilisateur

DX7mega128 Page 1 of 8 User Guide v1.30

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Yamaha DX7mega128 Expansion User Guide

* Welcome to *

* DX7mega128 *

1: Introduction

The DX7mega128

is essentially a “lite” DX7 SuperMAX+ type expansion. It provides the

following new features:

MEMORY EXPANSION

 4x memory expansion: There are now 128 patches

(what Yamaha calls "voices")

arranged in 4 banks of 32. Each patch is directly selectable by standard MIDI Patch

Change messages.

 The Function Settings can be saved as a single global value or on a per-patch basis.

GLOBAL PARAMETERS

 MIDI Transmit Channel: You can set the MIDI OUT channel from 1 to 16. (MIDI IN is

already settable in the Yamaha factory DX7 v1.8 firmware using button Function 8).

 Local On/Off: You can set whether the local keyboard sounds the internal FM sound

engine (or not).

 MIDI Receive in OMNI mode (receives on any/all channels).

PATCH PARAMETERS

 Programmable Keyboard Zone: Each patch can utilize a settable active keyboard zone

(low key to high key) within which the local keyboard sounds the internal FM sound

engine per patch.

 Programmable Patch Volume: Each patch can utilize a volume to even out the DX7

levels when changing patches.

 Voice Stacking: You can stack and detune two or four voices of the same patch. You

then have a choice of 16x1, 8x2, or 4x4 polyphony. The detuning can provide chorus

effect and/or chording and/or octaves (for example).

BUG FIXES

 Includes the fixes for the DX7 Fixed Frequency table bug and also includes the faster

boot.

 [v1.30+] Hardware-selectable MIDI Velocity Offset fixes the stock DX7 velocity issue.

The information provided in this document is intended for informational purposes only and is subject to

change without notice. Information may be changed or updated without notice. We may also make

improvements and/or changes in the product(s) described in this information at any time.

In this document the term "patch" is used to denote a programmed sound. For some unknown reason back

in the 80's, Yamaha called these "voices". The typical use for "voices" these days is to indicate the degree

of polyphony (how many keys you can hold down at once and get sound for).

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Installation

You are looking at the wrong document. Please refer to the DX7mega128 Installation Guide

available on the www.musictechnologiesgroup.com website.

Manual Conventions

Regarding the LCD, this manual shows the variable part of the LCD content using an underline.

The DX7 itself is not able to underline more than one character, but this convention makes it

easier to visualize the changing part of the LCD versus the fixed part.

THIS AREA IS FIXED

AND THIS: CAN CHANGE

Version Check

You can check the version of your DX7mega128 by pressing the brown FUNCTION key and

while holding it down press and hold 16 and 32. You should see a version message such as:

DX7mega128

Version 1.20

MIDI Out Vel=+0

Version 1.30

Press the green INTERNAL button twice to escape.

Updates to MIDI (Function Button 8)

The following items are available on button #8 in Function mode:

MIDI Ch In = 1 Settable MIDI Receive channel, or OMNI mode

Local Control=ON Enable/Disable keyboard play of DX7 sounds

SYS INFO UNAVAIL Enable/Disable System Exclusive

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Recommended Initialization

After installing the board, or any time the battery is changed, there can be some random data in

the DX7 RAM. Check and set the Function parameters and load some patch data to begin using

your new DX7mega128:

1. Turn the Internal Memory Protect OFF to enable saving settings and data.

2. Set the expander “Function/Patch” value OFF so that one global set of function data is used

(for now).

3. Initialize the expander Function data using the “Function INIT?” Menu option (choose Yes).

4. Set the expander active Memory Bank to 1.

5. Load a set of patches from cartridge or system exclusive. If the latter is used, then Sys Info

must be set to Available first.

Steps 1 and 5 are standard DX7 user manual stuff. For the other steps you need to read this

entire manual anyway, so take the time to do that and make note of how to perform steps 2, 3

and 4. And if you haven’t read the Yamaha DX7 user manual, well … consider it.

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2: Operation

All of the new operating parameters are accessed using button 12 and/or button 13 in Function

mode. These two buttons take you up and down the list of new Function parameters and the

menu wraps around if you press the same key repeatedly. The DX7 remembers the last activated

Function parameter and it is “live” on the panel (data slider and Yes/No buttons) even in normal

“play” mode.



FUNCTION CONTROL

Memory Bank = 4



FUNCTION CONTROL

Volume Out = 5



FUNCTION CONTROL

Func/Patch= OFF



FUNCTION CONTROL

Func Data INIT?_



FUNCTION CONTROL

MIDI Ch Out = 16



FUNCTION CONTROL

KB Zone Lo = C1



FUNCTION CONTROL

KB Zone Hi = C6



FUNCTION CONTROL

Voice Stack= 2x8



FUNCTION CONTROL

Detune Coarse…



FUNCTION CONTROL

Detune Fine…

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2.1 Memory Bank Selection

Recall that the DX7 has 32 internal patches accessed by pressing the INTERNAL button and

then one of the patch numbers 1 though 32.

The DX7mega128 has four banks of these to make the 128 patches:

Bank 1 Patches 1 to 32 = MIDI patch numbers 1 to 32.

Bank 2 Patches 1 to 32 = MIDI patch numbers 33 to 64.

Bank 3 Patches 1 to 32 = MIDI patch numbers 65 to 96.

Bank 4 Patches 1 to 32 = MIDI patch numbers 97 to 128.

To select a Bank and patch from the front panel, press Function button to activate Function

Control. Using button 13 (Next Menu) or button 12 (Previous Menu), locate the menu item

Memory Bank:

FUNCTION CONTROL

Memory Bank = 4

You can then select which bank is active using the Data Slider or + / - buttons. The next patch

you select will come from the memory bank you chose. Even when you return to play mode (say,

by pressing INT and/or a patch number), this function remains active so you can continue to

change banks with minimal button pressing. Please also see the caveat below.

A convenient way to select banks from your now expanded memory is to leave the most recently

selected MEMORY BANK button "live" in Function mode. When you return to "play" mode the

data entry control remains active on the memory bank parameter thus making easy to access all

128 voices.

When you select a patch via the front panel, its patch number (1 through 128) will be transmitted

on the DX7's MIDI OUT.

Another way to select patches is through MIDI IN. The patch numbers correspond to the patch

numbers 1 to 128 in the table above. That is, on receipt of a MIDI Program Change message on

the correct MIDI channel, the correct bank and patch will be activated. Note that if you have

cartridge installed it will be played in place of Bank 2.

Each bank must be saved or loaded individually using a cartridge or over MIDI.

CAVEAT: Keep in mind that this operating rule is the same for any function button. That means

for example, if the most recently selected Function is Volume, you could accidentally turn the

sound off without knowing the reason.

2.2 Patch Volume (can be saved per-patch)

FUNCTION CONTROL

Patch Volume = 7

The overall volume can be set to a value from 0 to 7. This allows you to trim the patch volume

levels for the appropriate impact when playing live or switching from patch to patch.

This data can be saved per-patch if the Function Data Per-Patch setting is turned on.

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2.3 Function Data: Per-Patch or Global

This setting determines whether or not there is one global set of Function Parameters or if the

Function Parameters are set on a per-patch basis.

FUNCTION CONTROL

Func/Patch= OFF

The traditional setting for the original DX7 is that there is one global set of Function Parameters.

You can continue this tradition by setting Func/Patch (function per patch) to OFF. If you would

prefer to save Function data with each patch, then set Func/Patch to ON.

In addition to the regular DX7 function parameters

 Poly/Mono, Portamento, Aftertouch, Pitchbend, Modulation Wheel and Breath Controller

the new parameters

 Volume, Active Keyboard Zone and Voice Stacking

are saved with each patch when this is enabled. If you don’t utilize Function/Patch, then the

Volume setting isn’t really of much use since it will be global and there is already a dedicated

analog Volume slider.on the DX7.

2.4 Function Data: Initialization

This sets the Function Data to a known good state. This should be performed after board

installation and whenever dubious function data is found (such as might happen after loading

from a ROM or RAM cart or Sys Ex receive or changing the battery)

FUNCTION CONTROL

Func Data INIT?_

To initialize the Function Data, simply locate this menu item and press the +/Yes button.

2.5 MIDI Transmit Channel (global parameter)

All of the MIDI settings are global, in that they are NOT saved with a patch. They are saved

overall for the synthesizer.

FUNCTION CONTROL

MIDI Ch OUT = 1

The MIDI note data, patch changes, etc. will be transmitted on the MIDI Channel specified here.

Using the Data slider or the Yes/No buttons, select the MIDI OUT channel you want, the range is

1 to 16.

Note: The MIDI IN channel is established via the standard DX7 Function button 8.

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2.6 Active Keyboard Zone (can be saved per-patch)

This function specifies the zone or region of the keyboard that will control the DX7 by setting a

Keyboard Low key and a Keyboard High key. It uses two screens:

FUNCTION CONTROL

KB Zone Lo = C1

FUNCTION CONTROL

KB Zone Hi = C6

The first screen sets the lowest note that will activate the internal sound. The second screen sets

the highest note that will activate the internal sound. The range is from C-2 to G8.

The value is chosen using the Data Slider or the + / - buttons.

Played notes outside the Active Key Zone will still be sent out on the MIDI transmit channel.

This data can be saved per-patch if the Function Data Per-Patch setting is turned on.

2.7 Voice Stack and Detune (can be saved per-patch)

The last three screens are used to set the Voice stacking mode and detuning of the extra voices.

DX7mega128 allows you to stack a DX7 patch in modes of 16x1 (standard, no stacking), 8x2 or

4x4. Each of the extra voices can have its pitch offset. Thus you can create not only

chorus/flange type effects, but also octave and chording.

FUNCTION CONTROL

Voice Stack= 2x8

To utilize this feature, the first step is to select which Voice Stack mode you would like. There are

up to three additional voices, or copies of the patch, available. The additional voices are called

"2", "3" and "4". You access each in turn by pressing the same function button over and over

again.

If you are in mode 16x1, then only the original Voice1 is used. All Detune settings are ignored.

If you are in 8x2 then the original Voice1 and Voice2 (coarse and fine) are used. The Detune

settings for 3 and 4 are ignored.

If you are in 4x4 then all voices tunings are used.

Stack Voice Coarse Pitch: Here you can set the coarse pitch for each of the three additional

voices in semitones from -24 to +24. The modifiable coarse value is the whole number portion to

the left of the decimal point

Voice Stack Mode

COARSE 2=-12.00

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Voice Stack Mode

COARSE 3=- 5.00

Voice Stack Mode

COARSE 4= 7.00

Stack Voice Fine Pitch: Here you can set the fine pitch for each of the three additional voices in

cents from .00 to .99. The modifiable fine value is the fractional portion after the decimal point.

Voice Stack Mode

FINE 2=-12.00

Voice Stack Mode

FINE 3=- 5.00

Voice Stack Mode

FINE 4= 7.00

If you want a negative fine adjustment alone, start with -0.00 and then adjust the Fine setting.

This data can be saved per-patch if the Function Data Per-Patch setting is turned on.

MIDI Note-On Velocity Fix [v1.30+ only]

The stock DX7 keyboard has a restricted range on the maximum MIDI Note-On velocity it

transmits. If you strike a key extremely hard you can get a maximum velocity out of 118 ($76

hex). A hardware fix has been included that allows the player to obtain full MIDI Note-On velocity

of 127 ($7F hex) without fear of damaging the keybed.

The DX7mega128 circuit board has a switch, S1, that allows you to change between default (0)

and full velocity (+3) operation. This switch is not intended to be changed on-the-fly with the

power on, but you can try it for an A:B comparison if your patches are backed up.

When the switch is to the right, the setting is +0 (stock). When the switch is to the left, the setting

is +3 (enhanced). Remember, you can verify this setting by doing a Function+16+32 version

check.

Enjoy your updated DX7!

See the MTG web site for more great vintage synth and drum machine goodies.

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