GM SOUND MODULE
GZ-50M
(with price)
POWER
VOLUME
GM SOUND MODULE
MIN
MIDI
MONITOR
DEMO
PHONES
MAX
GENERAL
-- 2 --
CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
MIDI Messages receivable with GZ-50M . . . . . . . . . . . . . . . . . . . . . 3
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Major waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PCB View and Check Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SPECIFICATIONS
GENERAL
Sound source:
The General MIDI system 1
Number of tones:
128
Number of drum sets:
8
Number of layer voice: 32
Digital effects:
10, including
Reverb-1, Reverb-2, Reverb-3, Chorus, Tremolo,
Phase Shifter, Organ SP, Enhancer, Flanger, EQ Loudness
Demonstration tune:
Suite for Rebecca (Arranged and programmed by Wojtek Gogoleski)
Volume control:
Analog volume
MIDI monitor:
LED
Tuning:
Center: 440 Hz
Terminals:
Headphone Jack [Output impedance: 68
, Output voltage: 0.3 V(rms)MAX],
Line Out Jack [Output impedance: 2 K
, Output voltage: 1.5 V8rms) MAX],
MIDI IN Jack, AC Adapter Jack (9 V)
Power source:
AC source only: AC adapter
Power consumption:
2.8 W
Dimensions (HWD):
35 x 113 x 169 mm (1-3/8 x 4-7/16 x 6-5/8 inches)
Weight:
450 g (1 lbs)
ELECTRICAL
Current drain with 9 V DC:
No sound output
210 mA
± 20%
Maximum volume
230 mA
± 20%
with 32 polyphonic in tone No.078
Volume; maximum, Touch response: maximum
Phone output Level (Vrms with 8
load each channel):
with keys C6 and F6 in tone No.078
85 mV
± 20%
Line output level (Vrms with 47 K
load each channel):
with keys C6 and F6 in tone No.078
300 mV
± 20%
Minimum operating voltage:
4.0 V
-- 3 --
MIDI messages receivable with GZ-50M
MIDI channel:
1 - 16 channel
Note On/Off:
Note number
0 - 127
Velocity
1 - 127
Program change: 0 - 127 on channel 1 -9 & 11 - 16
0 - 7 on channel 10
Pitch bend:
00H/00H - 7FH/7FH
Control change:
Modulation
Control No. 1
0 - 127
Volume
Control No. 7
0 - 127
Pan
Control No. 10
0 (left) - 64 (center) - 127 (right)
Expression
Control No. 11
0 - 127
Hold
Control No. 64
0 - 63: Off, 64 - 127: On
Sostenuto
Control No. 66
0 - 63: Off, 64 - 127: On
Soft
Control No. 67
0 - 63: Off, 64 - 127: On
Effect depth
Control No. 91
0 -127
All sounds off
Control No. 120
Reset all controllers
Control No. 121
* See next page for information about the initial settings.
Local control On/Off
Control No. 122
0: Off, 127: On
All notes off
Control No. 123
Registered Parameter Number (RPN)
Control No. 36: LSB, No.37: MSB
Pitch bend sense Control No. 100
00H
Control No. 101
00H
Data entry
Control No. 6
00H - 0CH
Control No. 36
00H
Fine tuning
Control No. 100
01H
Control No. 101
00H
(20H: -50 cents)
Data entry
Control No. 6
20H - 40H - 60H
(40H: center)
Control No. 36
00H
(60H: +50 cents)
Coarse tuning
Control No. 100
02H
Control No. 101
00H
(34H: -12 seminotes)
Data entry
Control No. 6
34H - 40H - 4CH
(40H: center)
Control No. 36
00H
(4CH: +12 seminotes)
RPN null
Control No. 100
7FH
Control No. 101
7FH
Active sensing:
Channel pressure: Reconized as modulation
System exclusive: Effect change
[F0][44][0B][09][xx][F7]
[xx]: [00] - [09], [0F]
[00]: Reverb1 (Stage)
[01]: Reverb2 (Hall)
[02]: Reverb3 (Room)
[03]: Chorus
[04]: Tremolo
[05]: Phase shifter
[06]: Organ speaker
[07]: Enhance
[08]: Flanger
[09]: EQ Loundness
[0F]: Effect OFF
GM system on
[F0][7E][7F][09][01][F7]
* See next page for information about the initial settings in The General MIDI system.
-- 4 --
The initial setteings
Pitch bend:
0
Modulation:
0 (Off)
Expression:
127 (Maximum)
Sustain:
0 (Off)
Sostenuto:
0 (Off)
Soft:
0 (Off)
Channel pressure:
0 (Off)
RPN:
Null
The initial settings in The General MIDI system
Channel 1 - 9 & 11 - 16
Program change:
000 (Piano)
Pitch bend:
LSB: 40H, MSB: 00H
Modulation:
0 (Off)
Volume:
100
Pan:
64 (Center)
Expression:
127 (Maximum)
Sustain:
0 (Off)
Soft:
0 (Off)
Effect depth:
127 (Maximum)
Pitch bend sense:
02 (2 seminotes)
Coarse tune:
LSB:40H, MSB:00H
Fine tune:
LSB:40H, MSB:00H
RPN:
Null
Channel pressure:
0 (Off)
Channel 10
Drum set No.:
0
Volume:
100
Pan:
64 (Center)
Expression:
127 (Maximum)
Effect depth:
127 (Maximum)
Soft:
0 (Off)
-- 5 --
Model
GZ-50M
MIDI Implementation Chart
Function ...
Transmitted
Recognized
Remarks
X
X
X
X
iiiiiiiiiiiiii
X
iiiiiiiiiiiiii
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
iiiiiiiiiiiiii
X
X
X
X
X
X
X
X
X
X
Mode 1 : OMNI ON, POLY
Mode 2 : OMNI ON, MONO
O : Yes
Mode 3 : OMNI OFF, POLY
Mode 4 : OMNI OFF, MONO
X : No
Basic
Default
Channel
Changed
Default
Mode
Messages
Altered
Note
Number:
True voice
Velocity
Note ON
Note OFF
After
Key's
Touch
Ch's
Pitch Bender
01
06, 38
Control
07
Change
10
11
64
66
67
91
100, 101
120
121
Program
Change :
True #
System Exclusive
System
: Song Pos
Common
: Song Sel
: Tune
System
: Clock
Real Time
: Commands
Aux
: Local ON/OFF
Messages
: All notes OFF
: Active Sense
: Reset
Remarks
*2: Vibrato effect is obtained when received either message of modulation or channel
after touch.
*3: Reception of pitch bend sense, fine tune, coarse tune, and RPN Null.
*4:
GM system on
[F0][7E][7F][09][01][F7]
Effect Change
[F0][44][0B][09][xx][F7]
[xx]: E_0[00] - E_9[09], Off[0F]
1-16 channel
1-16 channel
Mode 3
X
iiiiiiiiiiiiii
0 ~ 127
12 ~ 108
*1
O 9nH v = 1~127
X 9nH v = 0, 8nH V=ii
X
O *2
O
O *2
O *3
O
O
O
O
O
O
O
O *3
O
O
O 0 ~ 127
iiiiiiiiiiiiii
O
*4
X
X
X
X
X
X
O
O
X
*1:Different per tones.
ii = No relation
Modulation
Data entry
Volume
Pan
Expression
Hold 1
Sostenuto
Soft
External effect depth
RPN LSB · MSB
All sounds off
Reset all controllers
Version: 1.0