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CG Products XR1-E Quick Start Manual

Ring modulation oscillator
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XR1-E
Ring Modulation Oscillator
The XR1-E is an analog ring modulator desktop device with internal oscillator, preamp and LFO
in a nice hand-made casing.
It offers a wide variety of sounds, from the typical ringmodulation- and tremolo-like sounds to
glissando- and random-like patterns or distortion.
An integrated low-noise preamp (with much headroom) allows to adapt any kind of input
sources like microphones, e-guitars or electronic instruments.
A bicolor LED offers optical control of the oscillator's and preamp's overdrive behaviour.
The oscillator frequency is manually adjustable with two knobs for coarse and fine tuning and a switch for high and low
(tremolo) range. An envelope follower, a LFO and a Sample+Hold is provided for frequency modulation; further, there is a
minijack 1V/oct. input for control by e.g. an external synthesizer and another frequency control input for e.g. a pedal.
The XR1-E also offers a footswitch input socket to apply an external footswitch (not included) for switching between the
effect and the original. The XR1-E works with true bypass routing. Further, the output level of the processed signal can be
aligned by a knob on the rear.
Due to the ability of battery operation the device is independent from external power supply, but there is also a socket
for external DC (6-15V).
The XR1-E is based on a function generator chip, which warm and smooth sound makes it excellently suitable for ring
modulation and electronic music.
Low noise preamp
Bicolor LED for visual control
Frequency modulation with envelope follower, LFO and/or Sample+Hold
1V/oct minijack input and 2nd input for external frequency control
Footswitch input – true bypass
Output gain adjustable
Battery (6x AA) or with external DC operatable
Unique handmade casing
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Summary of Contents for CG Products XR1-E

  • Page 1 The XR1-E also offers a footswitch input socket to apply an external footswitch (not included) for switching between the effect and the original. The XR1-E works with true bypass routing. Further, the output level of the processed signal can be aligned by a knob on the rear.
  • Page 2 Quick start guide 18 19 15 16 13 14 1. Insert batteries or accus (6x AA Mignon) or connect a power adaptor (DC 9-16V, +- pole: the outer side of the plug). Set the power switch upwards to "On". Connect an 18 19 15 16 13 14...
  • Page 3: On/Off Switch

    Functions On/Off Switch Switches the power supply on or off. Objekt in Pfade: Note: In combination with an external power adaptor only the XR1-E will be switched off and not 18 19 15 16 13 14 the power adaptor itself.
  • Page 4: Footswitch Input

    Objekt in Pfade: Bypass This 'dry/wet' control knob is changing the ratio between input signal (preamplified) and the ring 18 19 15 16 13 14 modulated effect signal. Turning the knob fully left will provide only the preamplified input signal; by turning the knob clockwise the effect will be mixed with original.
  • Page 5 LFO Waveform Switch The LFO waveform is selectable between triangle (" ") and squarewave (" ")." " will provide a continously up-and down gliding pitch, while " " makes the oscillator shifting between two tones. 18 19 15 16 13 14 Envelope Follower/Sample+Hold/ext.
  • Page 6 This results in staircase- or glissando-like sound patterns, when the S+H is used for frequency modulation. The XR1-E's Sample+Hold is using the internal LFO and the envelope follower (with a threshold function) for sourcing the S+H inputs. The switch 'S+H' determines if the S+H is active, and whether the LFO is providing the clock signal and the envelope shape is the analog input of the S+H, or vice versa.
  • Page 7: Back Side View

    Falsche Zahlen 18 19 15 16 1V/octave minijack input (new from Rev.4) 18 19 15 16 13 14 If intended, the oscillator's frequency can be controlled by an external control voltage, for Objekt in Pfade: example from a modular synthesizer, with 1V/octave calibration. There is a trimmer above this socket (behind the hole in the casing) for adjustment .
  • Page 8 Each value of a carrier signal, C , is multiplied by a modulator signal, M , to create a new ring- modulated signal, R : R(t) = C(t) x M(t) (Wikipedia) Due to the XR1-E , the internal oscillator tone is multiplied with the audio input. Examples Input (=modulator) signal frequency >> oscillator (carrier) frequency ( Input signal: metallophone The volume of the metallophone sound varies with the oscillator amplitude (tremolo).
  • Page 9 Contact Christian Günther Forster Str. 50 10999 Berlin cg@mandalamat.de Phone: ++49 30 61286299 Mobile ++49 178 7699267 www.cg-products.de XR1-E website with video and soundfiles: http://www.cg-products.de/xr1-e/ Youtube: https://www.youtube.com/watch?v=2zDMeQAN_4I Soundcloud: https://soundcloud.com/cg-products/sets/xr1-e This documentation is for XR1-E Rev.4 www.cg-products.de/XR1-E_documentation.pdf For further versions (without switch 'S+H' ) please see here: www.cg-products.de/XR1-E_documentation_Rev.3.pdf...