The LxD is a dual-response, two channel, direct-coupled, Low Pass Gate, which utilizes two vactrols in order
to provide simultaneous control over the Amplitude and Frequency content of an INput Signal. It is, in
essence, a VCFA (Voltage Controlled Filter Amplifier). Unlike the Optomix and some other dual-Low Pass
Gates, the LxD offers two different filter responses.
The top channel, CH. 1, offers a 12db/ Octave response that is mildly-resonant, while the bottom channel,
CH. 2, offers a 6db/ Octave that is non-resonant. The OUTput of CH. 1 is normalled to the INput of CH. 2.
Utilizing this normalization puts the two channels in series, which is similar to the classic VCF into VCA
arrangement made popular by many monosynths of the 1970’s.
Folks have often described the sound of a Low Pass Gate as “ringing.” While the LxD circuits are not actually
ringing, that term does describe many of the sounds possible when using a LPG, such as the LxD, in order to
process complex, harmonically-rich signals, generated through Frequency Modulation or Ring Modulation.
The LxD, being a vactrol-based circuit, will never have the speed or tight tolerances found in many other
VCA and VCF circuits.
I would recommend that musicians desiring closely matched gain across
multiple channels of VCAs look elsewhere!
If you seek to program extremely-short sounds, clicks, pops,
or ticks, the LxD is not the best choice.
What the LxD does offer is extremely low-noise and low-distortion in a smooth, natural-sounding circuit!
Summary of Contents for LxD
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