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Thank you for choosing the LFO-expander to expand the possibilities of your
synthesizer.
Connections
All connections are made on the right side. For your convenience, the main out is
presented as a standard jack (6,3mm) and minijack (3,5 mm) output. Please use
only one of them.
Picture 1: Right-side view
Power Supply
The LFO-expander runs on 2 9V batteries (not included) or on an external DC-power
transformer (not included). When using a DC transformer, the batteries will be
automatically disconnected. Use a 12V transformer, 250mA or more. GND on the
outside, +12V on the center. Inverting the power will cause no harm. Connector
type: ø6,3mm x ø2,1mm
Foot pedal
The foot pedal can be an active pedal (containing a battery itself) with TS-jack or the
pedal can be a passive pedal (adjustable resistor) with TRS-jack. We recommend a
moog EP2 expression pedal or any pedal with the same specifications. A resistance of
50 k-Ohms works very well for the LFO-expander.
1
Pedal-in or CV-in :jack
6,3mm (TS or TRS)
2
Main out: mini-jack (TS)
3
Main out: jack (TS)
4
CV-in: mini-jack (TS)
5
CV-out: mini-jack (TS)
6
DC input (12V DC)
Note:
TS
= Tip – Sleeve
TRS
= Tip – Ring - Sleeve
CV
= Control Voltage
rev 1, 08-2010
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Summary of Contents for LFO expander LFO
- Page 1 = Control Voltage Power Supply The LFO-expander runs on 2 9V batteries (not included) or on an external DC-power transformer (not included). When using a DC transformer, the batteries will be automatically disconnected. Use a 12V transformer, 250mA or more. GND on the outside, +12V on the center.
- Page 2 When no batteries are installed, connect both connectors inside each other so their metal parts won’t cause short-circuit inside the unit. When batteries are running low of power, LFO frequency will decrease and the unit will perform not as it should be.
- Page 3 (vibrato), filter (wah-wah), amplitude (tremolo) or other destinations on your synth, depending on the possibilities of your synth. The LFO has an adjustable depth and speed that can be set with the controls on the top-panel. When applying a signal to the PEDAL IN / CV IN input, or by manually turning the MANUAL knob, both the speed and depth of the LFO signal can be influenced at the same time (!) at independent levels.
- Page 4 Waveform switch. Switches between rectangular and triangle wave shape for LFO signal. Initial depth of LFO. This knob controls the portion of the depth of the LFO that will not be influenced by the signal from the pedal-in jack or manual knob (12).
- Page 5 On many synthesizers, the CV IN is routed to the filter-circuit as well (just like the synth’s internal keyboard CV is) so the filter cut-off frequency is influenced by the output of the LFO-expander as well. On some synths, this key tracking can be set on or off.
- Page 6 Example 2: Vibrato on monosynth with CV-in / CV-out Connect the foot pedal as shown. Connect the synth’s KEY CV OUT to the CV IN of the LFO-expander. Connect the main OUT to the synth’s CV IN. Play the keyboard of your synth and use the foot pedal to control LFO speed and depth.
- Page 7 Example 4: Filter cut-off frequency control on ARP 2600 Connect patch cords as shown. Use invert output of voltage processor 1 and move that slider fully to the right. Play the keyboard of the ARP 2600 and turn the CV- knob to create filter sweeps.
- Page 8 ARP 2600 and turn the CV- knob to control the amount of filter keyboard tracking. Example 7: LFO speed keyboard-tracking on ARP 2600 Connect patch cords as shown. Do not use oscillators KYBD CV but one of the other osc inputs.
- Page 9 Example 8: Vibrato on Yamaha CS80 Connect the foot pedal as shown. Connect LFO-expander’s main out to “external in” of CS80. Set “external level” halfway. Set CS80’s Sub Oscillator function to “EXT.” and adjust VCO slider as shown in detail. Use the foot pedal to control vibrato.
- Page 10 CV OUT is routed to the LFO-expander’s 1:1 CV circuit. De sequencer’s CV OUT is connected to the LFO-expander’s PEDAL IN / CV IN and routed to the SWEEP-circuit. Now, carefully adjust the SWEEP-knob to obtain a 1:1 amplification of the sequencer’s CV out (set SWEEP RANGE to “high”).
- Page 11 ARP2600: Use the LFO-expander’s triangle wave to modulate osc2 Pulse Width (PWM). Use the EXTERNAL VIBRATO IN on your 3620 keyboard to apply LFO or pitch bends to all oscillators. Use a passive foot pedal to control any input on your 2600 (by using the sweep function).
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