Check the listing for details. Synthchaser ARP 4034 VCF Filter Submodule for ARP Pro Soloist, Pro/DGX, Explorer. Condition: New. Listed at 199.99 USD. Drop-in replacement submodule for the ARP 4034 Voltage Controlled filter used in the ARP Pro Soloist, ARP Pro/DGX (Mk I), and ARP Explorer I synthesizers. This is the infamous “Moog lawsuit filter”, the 24dB/octave ladder filter that was heavily based off of the Moog ladder filter. This is a very fat sounding 4 pole filter.Synthchaser modules are true to the original designs and professionally built using premium components with superior performance and reliability to those found in the original modules:Precision, low temperature coefficient film resistorsPolyphenylene Sulfide film capacitorsEIA Class I temperature compensating ceramic capacitorsAudio grade electrolytic or tantalum capacitors (may vary)All Synthchaser modules are backed with a 1 year guarantee against defects in materials and workmanship.New for 2021: Modules now ship with high quality long header pins pre-installed so this is ready to be installed into a Vintage ARP synthesizer! A standard 0.100″ header can be soldered so the module can be installed in alternate ways or put to alternate uses.