This is a Behringer FX2000 multi-effects processor. Model: FX2000. A versatile Behringer multi-effects processor for musicians, studios, and live sound users. The unit features 100 factory presets and 100 user presets, allowing users to quickly select ready-made sounds or save their own custom settings.
Joemeek meQ500 Equalizer Module — This is a Joemeek meQ500 four-band equalizer designed for the 500 Series format. This unit features the classic Joemeek green faceplate and provides musical equalization across four frequency bands. Each band includes frequency selection and gain control, with additional toggle switches for Q settings and Bell/Shelf curves. — Product Specifications — • Model: meQ500 • Serial Number: 00010048 • Format: 500 Series (requires compatible rack/power supply) • Bands: 4-Band EQ (High, High-Mid, Low-Mid, Low) • HF Band: kHz adjustment with Bell switch • HM Band: kHz adjustment with Hi-Q switch • LM Band: Hz/kHz adjustment with Hi-Q switch • LF Band: Hz adjustment with Bell switch • Peak Indicator: Integrated PK LED….
Here is a Behringer composer pro xl  MDX 2600, I am selling this as is because the input now put level meters sometimes work and sometimes don’t. Despite this flaw I believe this can be easily fixed and the unit does process and processes nicely. I am selling because I have since upgraded. 
Up for sale is the highly versatileBehringer Multicom Pro-XL MDX4600, a powerhouse 1U rack-mountable audio interactive quad dynamics processor. Key Features & Technical Specifications. IKA Compression: Interactive Knee Adaptation combines the flexibility of hard and soft-knee characteristics for natural audio leveling.
Discrete OSH OpAmp from Staccato Audio is a new way of designing audio products. Every OpAmp is treated individually. In the production stage we are pairing JFET transistors, assembling manually, testing, adjusting the output current, adjusting the output offset. OSH was made as a replacement for most of IC's Opamp in the market. DIP8 socket is easy to plug&play for traditional opamp. In some cases it might be used special adapter for SOIC8-DIP8 socket which has to be soldered directly to the mainboard PCB. The heat sink will burn your fingers but thats what a single ended class A is. Please check if your analog voltage supply meets the requirement for current efficiency. If not we can recommend a best solution. - Vishay 1% thick film carbon resistors, - Tightly paired Toshiba JFETs at the input stage. - 6 pairs Toshiba JFETs at the output stage is thermally coupled - Hybrid - means for us the placement of through hole bipolar transitor. SMD?s didn?t sound so tasty in this stage as the THT - 100% production quality control - OSH - Open Sound Hybrid - Datasheet available to download from staccatoaudio website *OSH-DV is made in vertical position because OSH-DHa or OSH-DHb makes collision with caps around OpAmp