7 UB-Xa User Manual
Arp Time
a - ¼ notes
b - 1/8 notes
c - 1/16 notes (default)
d - 1/32 notes
e - ¼ triplets
f - 1/8 triplets
g - 1/16 triplets
Arp Gate Time
Continuously adjustable between 0 and 99; gate is open for longer at
higher settings (default is 50).
Sync
a - Global – adding a new note to the notes being held will only add
the new note on the next applicable time interval.
b - Retrigger – adding a new note to the notes being held restarts
the arpeggio from the rst note.
Octave
Continuously adjustable between 1 and 6. If any value between 2
and 6 is selected then the notes held will be repeated up through
the number of selected octaves. On higher settings if the notes held
would go out of the UB-Xa’s range then low octaves will be played at
the end of the sequence (default is 1).
Pressing the rotary encoder when in one of the sub-menus returns to the
main options menu.
(11) HOLD – the Hold button allows an arpeggio to continue to play without
keeping the selected keys pressed. To use it hold down the keys on the
keyboard that you want to create an arpeggio from then press the button.
The arpeggio will continue to play until either the Hold button is switched
o or new notes are played; new notes will arpeggiate until the Hold
button is switched o or a further set of new notes is played.
When the arpeggiator is not running the Hold button will apply an innite
sustain at the level of the loudness sustain control (47) to any notes being
played when it is activated. Other notes can be played on top of the held
notes and will be subject to the loudness envelope settings.
(12) ON – switches the arpeggiator on and o.
Low Frequency Oscillator (LFO)
The LFO is used for modulation and runs at frequencies that are largely below
human hearing. The LFO has two controls:
(13) RATE – controls the frequency at which the LFO is running. The minimum
is 0.06 Hz (approximately one cycle every 17 seconds); and the maximum is
50Hz (50 cycles per second).
(14) WAVEFORM – there are six modulation waveforms available:
• • Sine – a smooth rising and falling curve.
• • Sawtooth – a wave with a smooth downcycle followed by a rapid rise.
• • Square – alternating high and low states with no transition.
• • Ramp – the reverse of Sawtooth: a smooth rise followed by a rapid fall.
• • S&H – a random voltage derived from taking a sample of white noise at
the top of each LFO cycle.
• • SMP – samples the waveform from the separate LFO on the
performance panel to the left of the keyboard in the same way as S&H
samples white noise.
Pressing and holding the Waveform button for two seconds or more will put
the LFO into re-trigger mode (Trig LED lit); in this mode the LFO will start a new
waveform cycle for each new key played. This will not change the previously
selected waveform.
Modulation Section
The modulation section controls the routing of the LFO to allow modulation of
other sections of the UB-Xa.
(15) DEPTH –controls the amount of LFO modulation that will be sent to each
of the three selectable sources. When the control is fully to the left (CCW)
there is no modulation, regardless of routing - when fully right (CW) the
full output of the LFO will be routed.
(16) OSC 1 Frequency – routes the LFO to oscillator 1 at the selected depth to
produce a vibrato eect (frequency modulation).
(17) OSC2 Frequency – routes the LFO to oscillator 2 at the selected depth to
produce a vibrato eect (frequency modulation).
(18) FILTER – routes the LFO to the lter, which will cause the lter to open
and close above the base set using its frequency control.
(19) Pulse Width Depth – allows the LFO to modulate the width of the pulse
wave (see Oscillator section below) by varying amounts. When the control
is fully to the left (CCW) there is no modulation, regardless of routing -
when fully right (CW) the full output of the LFO will be routed.
(20) OSC 1 PWM – routes the LFO to oscillator 1’s pulse width.
(21) OSC 2 PWM – routes the LFO to oscillator 2’s pulse width.
(22) VOLUME MOD – routes the LFO to the Voltage Controlled Amplier (VCA)
(see below) to produce a tremolo eect at the selected depth.
Oscillators Section
The Voltage Controlled Oscillators (VCOs) produce the basic sound of the UB-Xa.
(23) OSC 1 FREQUENCY – controls the base frequency of oscillator 1, in four
steps of one octave.
(24) SAW – switches on Sawtooth waveform for oscillator 1 (Saw LED on).
(25) PULSE – switches on Pulse waveform for oscillator 1 (Pulse LED on), which
can be treated further by Pulse Width Modulation.
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17)
(23)
(26) (29)
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