Version OS 1.0
13 Appendix
13.1 MIDI Implementation
13.1.1 Midi Note Commands
Each instrument has its own channel to send or receive midi notes. The note number is
added to the pitch of the instrument. The basic internal tuning is on note C1 (36) and is
added from there on to the internal pitch.
Instrument Note Number Note Channel
Kick Drum 36-97 C1-C6 1
Snare Drum 36-97 C1-C6 2
Closed Hi Hat 36-97 C1-C6 3
Open Hi Hat 36-97 C1-C6 4
Clap 36-97 C1-C6 5
Rim Shot 36-97 C1-C6 6
Crash 36-97 C1-C6 7
Ride 36-97 C1-C6 8
X1 Sample 36-97 C1-C6 9
X2 Sample 36-97 C1-C6 10
FM Synth (max. 6 voices polyph.) 36-97 C1-C6 11
On channel 16, the Alpha Base offers a key mapping for all instruments. Each
instrument maps 4 notes on the keyboard. The pitch is added according to the 4 notes.
Instrument Note Number Note Delta Pitch
(semitones)
Channel
Kick Drum 36-39 C1-D#1 0, 6, 12, 18 16
Snare Drum 40-43 E1-G1 0, 6, 12, 18 16
Closed Hi Hat 44-47 G#1-B1 0, 6, 12, 18 16
Open Hi Hat 48-51 C2-D#2 0, 6, 12, 18 16
Clap 52-55 E2-G2 0, 6, 12, 18 16
Rim Shot 56-59 G#2-B2 0, 6, 12, 18 16
Crash 60-63 C3-D#3 0, 6, 12, 18 16
Ride 64-67 E3-G3 0, 6, 12, 18 16
X1 Sample 68-71 G#3-B3 0, 6, 12, 18 16
X2 Sample 72-75 C4-D#4 0, 6, 12, 18 16
FM Synth (fix chord) 76-79 E4-G4 0, 6, 12, 18 16
110 ALPHA BASE Operating Manual
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