User Guide

13. Other features - Page 201
Pearl 2004 Manual v1 - 27th August 2004
13.1.6 Audio gain links
You can change the sensitivity range of the audio input using the Preset
Gain Links.
The links are located near the audio connector. On the Borris 3
motherboard they are labelled L14, L15, L16. Link L16 for 0dB, L15 for
20dB and L14 for 40dB
On older motherboards they are labelled “Preset Gain Links” and the
gain for each link is printed on the board.
The link should normally be set to 0dB for speaker level, 20dB for line
level input, 40dB for a microphone level input.
13.2 MIDI functions
The Pearl can respond to or output MIDI note information which
emulates certain buttons being pressed or faders being moved. The
console can also respond to MIDI Timecode, which is used with script
files.
If you want to know more about MIDI, a good book to read is MIDI
Systems and Control by Francis Rumsey; Published by Focal Press,
ISBN 0-240-513000-2. There’s also a huge amount of information
available on the Internet, try searching for “MIDI specification”.
The MIDI mode is set on the User Settings menu to be MIDI master
(outputs MIDI when you turn on playbacks), MIDI slave (responds to
MIDI) or MIDI disabled. The MIDI channel the Pearl will respond to is
also set on this menu (note that you need to add 1 to the number
displayed by the Pearl to get the actual MIDI channel number).
13.2.1 What a MIDI command looks like
The normal MIDI command is: STATUS BYTE1 BYTE2
Or in binary, 1cccnnnn 0xxxxxxx 0yyyyyyy
ccc = the MIDI command (note on, program change etc)
nnnn = the MIDI channel number (set on the User Settings
menu).
xxxxxxx and yyyyyyy are the data bytes.
MIDI often works in “running status” mode. If a lot of the same type of
command is being sent (lots of note on’s etc.) then the status byte can
be missed out. The receiver knows that if it doesn’t get a status byte, it
just has to run with the last one it received.
13.2.2 MIDI commands used by the Pearl
The Pearl uses standard MIDI commands. The usual name for these is
given in italics. All commands are given in hexadecimal notation ($9n),
where ‘n’ is the MIDI channel number. So a note on command for MIDI
channel 3 for example would be $92.
Set playback page : program change ($Cn xx)