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How to Read a MIDI Implementation Chart
O: MIDI messages that can be transmitted or received
X: MIDI messages that cannot be transmitted or received
• Basic Channel
This is the range of MIDI channels on which MIDI messages can be transmitted (received). The MIDI
channel setting will be retained even when the power is turned off.
• Mode
Most keyboards today use mode 3 (omni off, poly). This means that MIDI messages will only be
received on a specific MIDI channel, and will be played polyphonically.
The MIDI “mode” setting is relevant only to reception.
• Note Number
This is the range of note numbers that can be transmitted (received). Note Number 60 is middle C (C4).
• Velocity
This is the range of velocity values which can be transmitted (received) as part of each Note On or Note
Off message.
• Aftertouch
Polyphonic: aftertouch is independent for each key in the channel.
Channel: aftertouch applies equally to all keys in the channel.
• Pitch Bend
The SPD-20 does not transmit/receive this data.
• Control Change
These are the Control Change numbers which can be transmitted (received), and the control functions
they can have. For details refer to the MIDI Implementation.
• Program Change
The Program Numbers in the chart are the actual data values. The Patch numbers will be one number
higher.
• Exclusive
Patch data can be transmitted and received as an Exclusive message.
• Common, Realtime
This MIDI message is used when the SPD-20 plays concurrently with a sequencer or rhythm machine,
or when Start/Stop/Continue messages are in effect.
• Other
This category includes messages such as Active Sensing (to monitor the integrity of MIDI connections),
which help keep a MIDI system running properly.
NOTE
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