video upload by New England Analog Archives
Note this demo is from 7 years ago.
"This video features an ARP Omni 2 synthesizer that has been modified with a custom LFO expander daughterboard. The PCB comes assembled and measures 2.7 x 3.2 cm.
This upgrade is simple to install, and it provides the LFO with 2 additional waveforms. A 3-position toggle switch controls the waveform selection. An adhesive-backed overlay decal is provided with the kit. The switch will allow sine, square, and random LFO waveforms to be selected. Kit includes instructions for expanding the range of Omni 2 VCF so that it can self-oscillate. This modification greatly expands the sonic possibilities of the ARP Omni. This kit will work on ARP Omni 1 as well. It can also be used to add an auxiliary sample and hold waveform to ARP Axxe, Odyssey, and Quadra LFOs."
via this listing
"The unit has been well maintained and has had the following work/mods done:Replaced the noisy ARP power supply with a Power One linear supply
Unit was completely recapped in 2015.
All analog ICs and digital ICs were replaced
All sliders removed and restored. All now move smoothly.
Slider caps replaced with new ones.
Pratt Read keyboard bushings replaced in 2015.
Aftertouch added to the keyboard.
Aftertouch amount is routed to the ACC/PEDAL slider. The aftertouch affects the VCF cutoff. Additional waveforms added to the LFO. Originally only had sine LFO. Added square and sample & hold LFO. Sample & hold is the same circuit as ARP Odyssey MK1 S&H. Sounds great. 4075 VCF module recapped and had the cutoff frequency design error corrected. (Originally there was a design error, keeping the cutoff from fully opening up)
The finish on this Omni is not pristine. When I got it, it had been neglected for years after being in storage. Cosmetically, this is a 6/10 as there is evidence of lots of use on the powder coating.
I've attached a video deomonstrating the LFO mod I did to this Omni. The unit in the video is actually this Omni, but I have since removed the LED sliders, since I thought they were annoying."
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