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A8 - MMS - NTS-1 - Arpeggiator


k-Pack

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Shortly after the Atari was sync-ed up with the PO-33 using the joystick port clock output, the Atari MIDI output was connected to the PC MIDI input to monitor the data stream.  I wish I could remember why.

 

That's when I noted that there was a MIDI clock ($F8) being sent from the Atari.  I guess the manual wasn't lying. There was never much use for a MIDI clock to sync my arpeggiatorless MIDI equipment. Now I can see where it might be handy to sync the Korg NTS-1's and/or MicroKorg's arpeggiator using the Atari MIDI clock. 

 

This is what was learned about programming the Korg NTS-1 arpeggiator.

 

 

There are 3 controls assigned to the NTS-1's arpeggiator and one that is set with the B-knob. CC117 - type, CC118 - Chord, and cc119 - length (number of notes in the sequence).

 

When an external clock signal is not autodetected ARP-Knob B is used to set the arpeggiator's tempo.  If an external clock signal is autodetected the knob is used to set up the step duration of 16th, 24th, 32nd, 48th, or 64th. This you will have to set while the NTS is receiving a clock.  

 

Also be aware that changing the Atari clock temp during a song is autodetected after and may take a note or two to set.

 

Note: if you want to turn off the NTS-1's internal clock, a mono 3.5mm jack can be plugged into the SYNC-IN plug in the rear of the unit. Good for watching the CC changes using a MIDI monitor.

 

 These CC's values were derived from watching the CC changes using a MIDI monitor.  I'm not sure if they will change when custom programs are added but there are no slots for custom arpeggiator types.  If there are errors, the Length table is the one that is most likely to have them.

 

 

ARPEGGIATOR TYPE (cc117)

TYPE

VALUE

UP

0

DOWN

12

UP-DOWN

24

CONVERGE

36

DIVERGE

60

CONVERGE-DIVERGE

72

DIVERGE-CONVERGE

84

RANDOM

96

STOCHATIC

127

 

ARPEGGIATOR CHORD (cc118)

Cord

Button

Value

Octave

OSC

0

Major Triad

FIL

21

Major Suspended

EG

42

Major Augmented

MOD

63

Minor Triad

DEL

84

Minor Diminished

REV

127

 

 

ARPEGGIATOR LENGTH (cc119)

Length

Setting

 

Length

Setting

1

0

 

13

64

2

7

 

14

69

3

13

 

15

76

4

17

 

16

81

5

23

 

17

86

6

28

 

18

91

7

31

 

19

98

8

39

 

20

102

9

44

 

21

107

10

48

 

22

113

11

53

 

23

118

12

59

 

24

124

 

 

 

MMS - controlling arpeggiator example

 

A couple of chord progressions were programed into MIDI MUSIC SYSTEM.  With the arpeggiator off, Voice 21 plays notes C-A-D-G and Voice 22 plays the notes C-A-F-G. When the arpeggiator is turned on an arpeggiation in the key signature will play.  Voice 21 plays C major-A minor-D minor-G major and Voice 22 plays C major-A minor-F major-G major.

 

Play Voice 1 to sequence the music.  The tempo and arpeggiator CC#s are set and then the Loop plays V21 and V22 four times.

 

image.thumb.jpeg.e348bad938f339250a5d4cb4da761299.jpeg

 

The NTS-1 was recorded. The first loop was played with the arpeggiator off.  The APR button was pressed just before the second loop started. The oscillator and effect settings were not changed from their cold start default settings.

 

The music was played before recording to adjust the step duration to 1/16.  The tempo also needed to be auto detected and then auto adjusted. The last tempo detected will be used at the start of the next play through. This was annoying.  Its something to remember when making tempo changes during play.

 

 

 

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