4
Sound Engine Structure
What Is a “PATTERN”?
The performance data that you
record is called a “pattern.”
The TR-909 Software Rhythm
Composer has 128 patterns (16
patterns x 8 banks); each pattern
has eight variations (A–H).
What Is a “KIT”?
The 11 instruments are collectively
called a “kit.”
The TR-909 Software Rhythm
Composer has 128 kits.
The pattern plays the instruments
of the currently selected kit.
Variation
Pattern 1–128
A
C
B
D
E
G
F
H
Kit 1–128
Instrument x 11
BASS
DRUM
A pattern plays the inst of
the kit.
Variation
Pattern 1–128
A
C
B
D
E
G
F
H
PATTERN 128
PATTERN 3
PATTERN 2
PATTERN 1
KIT 128
KIT 3
KIT 2
KIT 1
INST
INST
Parameter
BD
INST
Parameter
SD
INST
Parameter
RC
KIT
Parameter
128 kits
128 patterns
KIT
PATTERN
BANK
B
STEP data
H
STEP data
A
STEP data
VARIATION
Pattern
Setting
TR-909 Software Rhythm Composer
BANK 1
Patterns
Kits
Pattern 1
Pattern 2
Pattern 3
•
•
Pattern 128
Kit 1
Kit 2
Kit 3
•
•
Kit 128
128 patterns
128 kits
BANK 2
Patterns
Kits
Pattern 1
Pattern 2
Pattern 3
•
•
Pattern 128
Kit 1
Kit 2
Kit 3
•
•
Kit 128
128 patterns
128 kits
There is no limit on the number of banks
