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Advanced Operation
To provide more in-depth detail of the controls and how to make the most of the machine, this section
goes into detail on each aspect of the system.
Internal Clocking and Timing
Using External Clock
The machine uses a 24ppq internal timebase. The clock can be supplied by MIDI timing ticks, by an
analog (+5V or greater) clock input signal, or by the internal clock generator. The analog clock
triggers on the rising edge and can support clock rates up to approx. 100pps. (250bpm) Each clock
pulse input accounts for 1/24th of a beat. When using external clock mode you can adjust how many
clock pulses are required to advance the pattern one step. These are set by the CLOCK SPEED pot and
range from 1-24 pulses per step. The supported divisions allow: 1, 2, 3, 4, 6, 8, 12 or 24 notes per beat.
(24 ticks) The division is only changed at the end of a beat (24 internal counts] to prevent jumpy
behaviour.
When external clocks are input either by MIDI or by the analog clock input, MIDI clock pulses are
transmitted on the internal MIDI header. In this way you can convert analog clock signals to MIDI
signals.
Note: Using MIDI and analog clock at the same time may produce undesired results.
To prevent stuck notes in the case of external clock loss, playing notes are automatically killed if no
clock signals are received for 5 seconds. This means that extremely slow tempos of less than 0.5bpm
are not supported. (You might require caffeine if this is the tempo of your piece!)
Using Internal Clock
When using the internal clock mode, the CLOCK SPEED pot sets the tempo. In this mode the pattern
always advances four steps per beat. (16th notes) The tempo generated by the internal clock can
range from approx. 19 to 400bpm. When using the internal clock mode, MIDI clock is automatically
transmitted. If the CLOCK SPEED pot is turned all the way down the clock will be stopped.
Clock LED
The clock LED will pulse for a short time at the beginning of every beat. (every 24 clock ticks)
GATE TIME Control
When notes are played, the GATE TIME control affects how long the notes will play. When in the
minimum setting, the note will play for 1 internal clock tick. At the maximum setting, the note can
play for more than two full beats. Note that this control scales automatically with the tempo. Some
synthesizer patches might be barely audible if the gate time is short and the tempo is high.
User Manual
// K4815 // Pattern Generator
7p
Hardware Version D/E
Firmware Version 1.1x
February 16, 2011
© 2010 Kilpatrick Audio
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