Dac Calibration"Parameter; Led Brightness" Parameter; Midi Implementation; Channel Midi Messages - Roland TR-808 Owner's Manual

TR808-M
Indication of MIDI data receiving is disabled during factory setting. If necessary, it can be enabled
by user. The change can be processed with help of MIDI SysEx message.
3.3.4. "DAC CALIBRATION" PARAMETER
The parameter calibrates amplitude of trigger pulses for TR-808's sound generators so that all
generators would be launched correctly.
Parameter value is set to maximum (value 127) during factory setting. If necessary, the value can
be changed with help of MIDI SysEx message. Calibration procedure in detail is described in
installation manual.

3.3.5. "LED BRIGHTNESS" PARAMETER

The parameter sets brightness of LED indicator installed under the START / STOP button.
Parameter value is set to maximum (value 63) during factory setting. If necessary, it can be
enabled by user. The change can be processed with help of MIDI SysEx message.

4. MIDI IMPLEMENTATION

In MIDI operation mode, the interface uses MIDI channel commands, common system
commands and System Exclusive Messages.

4.1. CHANNEL MIDI MESSAGES

The interface receives channel MIDI commands on MIDI channel selected by "MIDI Channel"
global parameter (factory setting is MIDI channel Nr. 10; default MIDI channel number can be changed
with help of MIDI SysEx message – see chapter 3.3.1).
Only "Note On" and "Program (Patch) Change" MIDI channel commands are accepted. All others
channel commands are ignored by the interface.
4.1.1. NOTE-ON COMMANDS
The interface accepts MIDI note numbers in range from 0 (00h) to 120 (78h). Any of eleven TR-
808's sound generators can be assigned to every of accepted MIDI notes. Also none sound generator
can be assigned – that MIDI note is then ignored. Unacceptable notes - i.e. from 121 (79h) to 127
(7Fh) - are ignored always.
No part of this publication may be reproduced in any form without the written permission of CHD Elektroservis.
Pic. 4 – Drumset after factory reset
Copyright © 2015 CHD Elektroservis. All rights reserved.
MIDI Interface for Roland TR-808
6
Model 8-448 ver. 3.30