Manual General Music CD30 (page 25 of 36) (English)

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ENGLISH

The special Common Channel parts

Apart from the 6 instrument parts, the CD20/30 receives and

sends Style data on a special channel (Style number, tempo,

activation/disactivation of the Style control keys).

The special part, called the Common Channel, must also be

assigned to a Midi channel between 1-16. The factory setting

is channel 16. An instrument receiving or sending Style com-

mands to or from the CD20/30 needs to do so using this chan-

nel.

How to assign Midi channels on the CD20/30

1. Enter the MIDI mode by pressing [MIDI]. The first section

is “Channel selection”.

2. Press [MIDI] to get to the part programming page. Each

page contains two parts. The first page contains the Lower

and Upper parts, the second Drum and Bass, the third

Acc1 and Acc2. The Common Channel is on the fourth

page.

3. Use [PAGE] to change from one part to another and be-

tween pages.

4. Change the Midi channel assigned to the part using

[TEMPO-DATA].

5. Exit from the MIDI mode by pressing the two [ESC] keys

together.

The new settings are kept in the memory even when the

instrument has been switched off.

General Midi

Standardized sounds

The General Midi (GM) standard makes sound organisation

and the way sounds are selected similar on different types of

instrument.

When the CD20/30 is being controlled by an external

sequencer, the correct sounds are automatically selected.

The CD20/30 has two sound banks. The second is in Gen-

eral Midi standard while the first is a little different (instead of

the “Percussive” group you’ll find the “Drum” family). When

the option “MIDI:GeneralMidi” is set to ON, a drum kit from

the “Drums” family is always assigned to Midi channel 10,

while sounds from other groups (including the “Percussive”

group) can be selected on all the other channels.

The 16 General Midi parts

Six instrument parts can be controlled directly by the CD20/

30, but General Midi requires a multitimbral expander able to

receive on 16 different parts.

When the option “MIDI:GeneralMidi” (in the MIDI change

mode) is set to ON, the CD20/30 receives on 16 parts, in-

cluding its own 6 normal parts. This is how the parts and

corresponding Midi channels are mapped:

MIDI channel Part

1 GM 01

2 Bass

3 Acc 1

4 Lower

5 Upper

6 Acc 2

7 GM 07

8 GM 08

9 GM 09

10 Drum

11 GM 11

12 GM 12

13 GM 13

14 GM 14

15 GM 15

16 GM 16 (or Common Channel)

Assigning a different Midi channel to “standard” instrument

part (Upper, Lower, Drum, Bass, Acc1, Acc2) makes the in-

strument’s original channel no longer available. For exam-

ple, if channel 1 is assigned to the Bass part, an external

sequencer will not be able to send data to the CD20/30 on

channel 2.

To use the 16 parts as instrument parts, 1) activate General

Midi compatibility, 2) disactivate the Common Channel, 3)

leave the Midi channels assigned to the “standard” instru-

ment parts unchanged.

When the CD20/30 is controlled by another

instrument

How to change the Sound

1. To select a Sound from the second bank, the following

message must be sent to the CD20/30 parts:

Control Change 0, value 01

The Control Change 0 is often termed Bank Select. For

Sounds belonging to the first bank, the message is not

necessary.

2. After Control Change 0, send the Program Change mes-

sage by selecting the number which corresponds with the

Sound chosen. For example, to select Sound “16/Organ

1”, send Program Change number 16.

The master may list the Program Change numbers using

1 - 128 instead of 0 - 127. In this case it will be necessary

to add 1 to the Program Change numbers of the CD20/30

Sound list.

3. The Sound selected is now assigned to that particular in-

strument part.

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General Music CD30 Manual

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