AJH Synth SONIC XV User Manual

XV
User Guide
V1.10 25-02-2017
Diode Ladder Wave Filter
Thank you for purchasing the AJH Synth Sonic XV Eurorack synthesiser module, which like all AJH
Synth products, has been designed and handbuilt in the UK from the very highest quality compo-
nents. We hope that it will help and inspire you towards creating some great music and sound-
scapes!
The Sonic XV Eurorack module is a four pole Diode ladder lter, featuring the circuitry and sound
of the Musonics Sonic V synthesiser from the early 1970's. In addition to the regular 24dB Low
Pass output we have added a 6dB Low Pass output and a Bandpass output, along with full volt-
age control and level correction of the resonance on the 24dB output.
Two waveshapers/wavefolders have been added to hugely increase the sonic versatility of this
module, rstly there is a six stage diode breakpoint based wavefolder, the output of which can be
added to the input signal in any amount from 0 to 100% using a wet/dry mixer control. The drive
level of the wavefolder can be manually adjusted with the IN Wave control, or by patching a
control or modulation voltage into the IW-CV jack, it can be voltage controlled. There is also a
three position bias control switch that allows additional variation to the input waveshaping.
The second waveshaper is connected to the resonance loop of the lter and it adds distortion and
waveshaping to the resonance loop signal, again the drive can be adjusted manually or under full
voltage control from the RW-CV input. There is a wet/dry mix control so that resonance wave-
shaping can be added at any rate between 0 to 100%.
These additions take the diode ladder lter core way beyond it's original function, by using the
waveshaping options it becomes a " lter" module that can actually add harmonics to waveforms
rather than simply ltering them. With four independant CV inputs very complex ltering and
waveshaping sounds are possible that take it far beyond regular diode or transistor ladder lters.
Module width is 14 HP of EuroRack space and it is compatible with standard Euro Rack cases. The
height of the panel is 128.5mm, and depth is 24mm, or 34mm with the power cable attached.
There are four mounting holes at the corners of the module and we provide 4 of M3 rack xing
screws, along with a Eurorack compatible power cable. Current consumption is 70mA from the
+12V supply rail and 55mA from the -12V supply rail.
All AJHSynth modules are covered by a one year guarantee against manufacturing defects.
Notes:
It is important that the power supply ribbon cable is connected correctly, see the "Power Cable Orienta-
tion" section for more details. Also, we recommend that a high quality, low noise Eurorack power
supply is used with this modules, some switched mode PSU's generate high levels of line ripple which
may cause undesirable audio noise on the output.
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