Roland TR-808 - 2.2. Connection of TR-808 to MIDI Bus; TR-808 Operation and Parameters; 3.1. Operation Modes Selection

TR
TR TR
TR-
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-808 MIDI Interface
808 MIDI Interface808 MIDI Interface
808 MIDI Interface Model 8
Model 8Model 8
Model 8-
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-448 ver. 2.0
448 ver. 2.0448 ver. 2.0
448 ver. 2.0
4
Copyright © 2005 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permission of CHD Elektroservis.
Fig. 1 – Connection of TR-808 to MIDI system
Master Keyboard,
sequencer, PC ...
MIDI OUT
S
Y
NC
INPUT
OUT-
PUT
Rear panel of TR808
Special MIDI cable
5-pins 7-pins
2.2. Operation modes indication
In all working modes (DIN-SYNC and MIDI), the functionality of all original
LEDs on TR-808 panel remains the same as on the non-retrofitted instrument.
The LED can indicate received MIDI commands too - this can be done by
user with help of SysEx message. In this case, the LED always shortly blinks if
acceptable MIDI command is received. But in the case of dense data flow, short
blinks are just one constant extinction of the LED. The indication of received MIDI commands is
disabled during factory setting.
3. MIDI implementation
TR-8080 retrofit uses standard MIDI channel data, common system data and System Exclusive
Messages - see MIDI Implementation Chart in appendices.
3.1. Channel MIDI messages
MIDI channel 10 is used as a factory default. The channel number can be changed by MIDI
System Exclusive Message if it is necessary. Acceptable are "Note On" and "Program Change"
commands. All others channel commands are ignored.
3.1.1. Note-On commands
The interface receives MIDI notes from 12 (0Ch) to 90 (5Ah). Any of TR-808 tone generators (or
none) can be assigned to every of these MIDI notes. Assigning of tone generators can be changed by
System Exclusive Messages. Default factory setting is described in table 1 (see picture too), it
corresponds to C/M, GM, GS, XG standards. Drum maps of these standards are described in table 5
for comparison.
Values of "Velocity" of Note-on commands (second data byte) are converted to level of assigned
tone generators. It is possible to set the slope and the shift of conversion curve (dynamic range) of
assigned tone generator. It can be done by MIDI System Exclusive Messages. Default factory setting
is maximal dynamic range for all acceptable MIDI notes.
S T A R T
S T O P
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