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"Up for auction is a VERY rare Sequential Circuits Inc - ProFX Programmable Modular Effects System produced in the early 1980's.
This particular ProFX is even stranger as it is a preconfigured system dubbed the "Ambient Package" it includes the 524 Digital Delay, 522 Flanger/Chorus and 518 Spring Reverb modules and is housed in the Model 500 Chassis with System Controller.
there is alot of info online : google - sequential circuits ProFX
This instrument has been recently fully cleaned and checked out by a qualified professional audio service technician.. the pro-fx is very clean and fully working.
details on the particular effects in this rack:
500 System Controller:
The Pro FX Model 500 System Controller is the brain behind the Pro-FX Audio Processing System. Although the System Controller has no Audio Processing functions, this piece is required to supply power and programmable memory to the various effects modules. There is room for 64 patch memories within the onboard memory (ROM). Random Access memory (RAM) is required for extra modules to work with an expanded system. Two Operating Systems are known to exist 1.5 and 2.0 .
Other features of the Model 500 are Tape Sync for stepping through patches, memory back up via Tape Interface, Data Interface for daisy chaining 500 controllers, as well as
Footswitch INs and a CV in for routing control pedals to the functions of various modules.
OS: 2.0 is included, the internal backup battery was recently replaced durning testing (Oct 2012)
518 Reverb (module and tank)
The Model 518 Reverb includes a compact, rackmount six spring delay line, and a three-band equalizer which filters the input to and output from the reverb unit. The LP (lowpass) filter limits frequencies above its setting from 200Hz to 20 kHz. The HP (highpass) filter limits frequencies below its setting from 20Hz to 2 kHz. The MID (midrange) band filter has separate frequency (50 Hz to 5 kHz) and EQ boost/cut controls. For example a typical use would be to use the HP filter to prevent a bass drum from dominating the reverb. The module also features automatic limiting which reduces undesirable spring colorations. It contains a PEAK LED indicator for optimizing signal levels.
