GRP Synthesizer R24 Configuration guide

Grp R24 Step Sequencer – Owner’s Manual Supplement
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Grp R24 Step Sequencer
Owner’ Manual Supplement
Rev 1.1
Some parts of Grp R24 Step Sequencer require some careful procedures.
Row’s control unit
It should be remembered some basic knowledge.
Each Row in Grp R24 Step Sequencer has its own control unit – on Row A, B and C. Every control
unit allows to choose the behavior for the Row, indipendendtly on each Row. As you can imagine,
to be operational, the control unit should be activated, otherwise it will not function.
The main LED ON (at the top of the module) can be turned on or off:
•LED turned on: control unit manages controls for ORDER, STP RPT, ROW RPT, STP ADV; permits
CV and Gate out on their respective ports, for working with external analog devices.
•LED turned off: control unit is inactive; Row’s output CV and Gate are disabled and inactive.
When control unit on a Row is turned off, there’s not transmission of CV and Gate from analog ports
CV OUT and GATE 1 or 2 of that Row.
MIDI data transmission is always active, even when control unit is turned off.

Grp R24 Step Sequencer – Owner’s Manual Supplement
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Remote Control for SEQ MODE function
Remote control for function SEQ MODE works connecting a CV source to port SEQ MODE available
in the CONTROL IN section of Connections; it permits to change the advance mode depending on
CV value received (between 0 and +5 V). This control is easy to manage and verify: just seeing LEDs
turning on depending on received CV value.
Sadly, it is possibile to make some confusion if you are using ROW C for CV generation connected
at SEQ MODE input port: R24 works correctly, but it can land on a potentially useless condition.
As long as CV from ROW C stays on a value corresponding to SEQ MODE A,B,C or A+B,C,
everythihg is fine and controllable.
But when CV is strong enough to reach position SEQ MODE A+B+C, you’ll shut off control unit on
ROW B and C (logic enough: here you are working with just one sequencer, long 24 Steps, if you
want…), disabling controls CV and Gate from dedicated outputs of ROWS B and C.
With ROW C now disabled, R24 is in the condition of not to be able to perform other variations:
there’s no more tension available to vary SEQ MODE. To fo back into a “normal” condition, youl
should reset at minimum Step value on ROW C and you should disconnect the patch cable from
SEQ MODE control input.
Remote control on function ADV MODE
This one too can be potentially confusing but, in reality, is correct and logic. When you are driving
ADV MODE function with a CV value from ROW C, you can land on a potentially useless condition.
Don’t forget that remote control of function ADV MOD can browse one of six available advance
modes for R24 (FW, BW, FW/BW, PNDL, ALT, RND).
Since ALT mode turns off control unit for ROWS B and C, you can find yourself in the same possibile
condition previously illustrated: once reached (under CV from ROW C) advance mode ALT, there’s
no more CV tension for go away and you can’t go back, unless disconnecting patch cable from
control port ADV MODE.
This problem only occurs when CV tension is generated by R24 Step Sequencer itself. There’s no
problem when you are using any other external CV source for drive any available advance mode
of the Sequencer.
We are currently evaluating several possibile solutions.

Grp R24 Step Sequencer – Owner’s Manual Supplement
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Internal and External Clock
First of all, it should be clear that Step Sequencer Grp R24 works with an internal Clock at 48 pulses
per quarter.
This density is needed for obtain correct ratcheting on everyt TIME DIVISION settings.
In the same way, with R24, External Clock too should be dense enough: you’ll need a density of 24
or 48 ppq to obtain all ratcheting requested. The R24 Sequencer can advance also with a lower
external clock density (e.g., just one pulse per step), but – as you can imagine – you’ll loose most of
the ratcheting capabilities.
Here you’ll find a table with all the available ratcheting X2, X3, X4 against different Clock and Time
Division combinations.
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T.DIV&
INTERNAL&
CLOCK&
MIDI&CLOCK&
TTL&&&&1&&
TTL&&&&24&&
TTL&&&&48&&
&&
X2&
X3&
X4&
X2&
X3&
X4&
X2&
X3&
X4&
X2&
X3&
X4&
X2&
X3&
X4&
1&
OK#
OK#
OK#
OK#
OK#
OK#
KO&
KO&
KO&
OK#
OK#
OK#
OK#
OK#
OK#
2&
OK#
OK#
OK#
OK#
OK#
OK#
KO&
KO&
KO&
OK#
OK#
OK#
OK#
OK#
OK#
2t&
OK#
KO&
OK#
OK#
KO&
OK#
KO&
KO&
KO&
OK#
KO&
OK#
OK#
KO&
OK#
4&
OK#
OK#
OK#
OK#
OK#
OK#
KO&
KO&
KO&
OK#
OK#
OK#
OK#
OK#
OK#
4t&
OK#
KO&
OK#
OK#
KO&
OK#
KO&
KO&
KO&
OK#
KO&
OK#
OK#
KO&
OK#
8&
OK#
OK#
OK#
OK#
OK#
OK#
KO&
KO&
KO&
OK#
OK#
OK#
OK#
OK#
OK#
8t&
OK#
KO&
OK#
OK#
KO&
OK#
KO&
KO&
KO&
OK#
KO&
OK#
OK#
KO&
OK#
16&
OK#
OK#
OK#
OK#
OK#
KO&
KO&
KO&
KO&
OK#
OK#
KO&
OK#
OK#
OK#
16t&
OK#
KO&
OK#
OK#
KO&
OK#
KO&
KO&
KO&
OK#
KO&
OK#
OK#
KO&
OK#
32&
OK#
OK#
KO&
KO&
OK#
KO&
KO&
KO&
KO&
KO&
OK#
KO&
OK#
OK#
KO&
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