12
P 71
Clock1 divide ratio - (default: d2)
available values c24, c48 & d2 to d24,
- sets the ratio of MIDI clocks to output pulses from the Clock1 output.
c24
– special drum machine mode – outputs 24 cpqn – used for many drum machines
c48
– special drum machine mode – outputs 48 cpqn – for Linn & Oberheim drum machines
N.B. Some drum machines use other values e.g. the Roland CR78 uses 12 cpqn (div ratio 2)
If set to 2, there will 12 pulses from the clock1 output for every 24 MIDI clocks = 12 cpqn
If set to 24, there will be 1 pulse from the clock pulse output for every 24 MIDI clocks = 1 cpqn
(Note there are 24 MIDI clocks per quarter note)
Below is a table of values you can set the divide ratio to in order to obtain a clock pulse at various
musical time intervals:-
Note type
Divide ratio
CPQN (clocks per quarter note)
Crotchets
(quarter notes) 24 1
Crotchet triplets 16
Quavers
(eighth notes)
12 2
Quaver triplets
8
Semiquavers
(sixteenths) 6 4
Semiquaver triplets 4 6
Demisemiquavers 3 8
Demisemiquaver triplets 2 12
P 72
Clock1 shift (default: 0)
Range
0 to 255
- Sets the number of MIDI clock pulses allowed to pass before the Clock1 output starts giving out
clock pulses. Low values can be used to make Clock1 & Clock2 out of phase with each other. Higher
values can be used to delay the start of one clock relative to the other. This setting has no effect when
the clock has been started, it only has an effect immediately following a MIDI start or continue
command.
P 73
Clock1 voltage (default: 05)
- Sets the voltage of the Clock1 output. The following can be selected:
+5v output
[ 05]
+10v output
[ 10]
CLOCK2 output
P 80
Clock2 type (default: clock normal)
- Sets which MIDI controller will control AUX2 output
The following controllers can be selected:
Clock normal
[cLn]
Clock inverted
[cLi]
Stop/start normal
[SSn]
Stop/start inverted
[SSi]
Note trigger pulse
[t r g]
The ON voltage can be set using parameter 83 - clock2 voltage.
Inverted settings mean that on is zero volts and off is high. (like s-trig).
If ‘Note trigger pulse’ is selected, Clock2 will give a short trigger pulse whenever a valid new MIDI note
is received
– this can be used to drive the envelope generator on synths that require a separate trigger
for this. (Only usually needed by the Arp 2600, Arp Odyssey mk1 and a few modulars)
