Connecting the GR-0 to a Sequencer
On the Sequencer Side of Things
To connect your sequencer to the GR-20, the sequencer has to have a MIDI 
IN jack and a MIDI OUT jack. If you’re using a:
hardware, standalone sequencer—you’ll typically find a MIDI IN jack and 
a MIDI OUT jack on its rear panel. 
keyboard workstation—you’ll  typically  find  a  MIDI  IN  jack  and  a  MIDI 
OUT jack on its rear panel. 
sequencing program on a computer—MIDI connectivity has to be added 
to the computer in either of two ways. You can use a:
MIDI interface —which is  usually  a  rack-mounted or  tabletop  box 
that connects to the computer via USB or FireWire, and provides 
MIDI ports you can connect to your other MIDI devices.
sound card—that offers MIDI jacks,  or  a game  port  to which  you 
connect a special cable that provides MIDI jacks.
On the GR-0 Side of Things
Using a MIDI cable:
Connect the GR-20’s MIDI OUT jack to the sequencer’s 
MIDI IN jack.
Connect the sequencer’s MIDI OUT jack to the GR-20’s 
MIDI IN jack.
If you  don’t intend to use the GR-20’s own sounds, you don’t 
need to connect the sequencer’s MIDI OUT jack to the GR-20’s 
MIDI IN jack.
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Preparing the GR-0 for Sequencing
MIDI Channel
Select  the  basic  MIDI  channel  on  which  you  want  the  GR-20  to  send  and 
receive  data.  (As  we’ll  see,  this  channel  also  acts  as  the  first  channel  the 
GR-20 uses in its Mono transmission mode.)
Unless you have a MIDI system that provides each MIDI device its own 
set of 16 MIDI channels, select a channel no other device is using.
To set the GR-20’s basic MIDI channel:
Press SYSTEM EDIT repeatedly until the MIDI CH indicator lights.
Turn the Number/Value dial to select a basic MIDI channel, from 1-11.
Press EXIT—the GR-20 stores your settings.
Local Off
When you’re using a GR-20  patch  while  sequencing, notes can play twice: 
once from your guitar, and once more from the output of your sequencer.