Vintage Arp 2600 Synth synthesizer

via this auction
"Vintage mid 70's Arp 2600 in great shape. Although cosmetically average this particular Arp 2600 is a beast; has had a complete overhaul by Phil Cirocco of CMS. Has the added modules: filter and extra oscillator(more details on Phil's website), power supply upgrade, envelope mods, osc sync(this was done prior to Phil's work but was inspected /serviced by him), audio path upgrade etc etc. I have spent over 3K in rehab and upgrades and this Arp as Phil told me "rocks". I agree and I hate to let it go but this economy is...Phil worked on this arp less than 2 years ago and is functioning as it should but with any vintage synth general maintenance is necessary every year or two so it is likely due to have a good internal cleaning/calibration. The 3620 keyboard's electronics were serviced by Phil while the bushings were replaced less than three months ago by EARS in NYC so this keyboard is good to go."