This Roland RSP-550 multi-effect processor is a versatile piece of pro audio equipment that is perfect for musicians and sound engineers alike. With MIDI (DIN) In/Out, 6.35 mm (1/4") TRS/TS In/Out, and a rack-mountable form factor, this device is designed to fit seamlessly into any musical setup. Featuring a maximum sampling rate of 48 kHz and a wide range of digital effects and enhancements such as reverb, chorus, and echo, the Roland RSP-550 is sure to elevate any performance or recording session. This battery-powered device also includes presets and built-in effects for added convenience, and its compact 1U rack unit height makes it an ideal addition to any professional audio setup.

CONDITION: Working condition of the FX Processor, but the additional “Program Number” display does not work (see second photo). This is not critical, since the Main display works perfectly. And this allows you to fully work with the device, configure patches and see the name of the presets. Besides, I’m used to remembering presets by name, not by number, so this doesn’t interfere at all. The backlight on the main display has been replaced. At the moment it is set new bright backlight for the main display. 
Photos are of the actual unit, and part of the description; please examine them carefully. There are scratches and abrasions on the top of the case.

EPROM OS  v1.04 - Last Version :)  
Made In Japan (1991 year)  
220 Volt 

- 200 presets
- 39  algorithms
- 48 kHz
- Stereo In/Out
- Midi In / Out / Thru

Effect List (Algorithm List):
Reverberator HALL 1-3 
Room 1-2 
Plate 1-2 
Gate
Reverse Gate )
Ambience 
Modulation Reverb 
4-8 Tap Delay 
Tempo Delay 
Penta Chorus 
Space Chorus 
Stereo Chorus (Based on Roland Dimentson D (SDD-320))
4 band Chorus 
Ensemble 
Stereo / Quad Pitch Shifter 
Multi Phaser 
Dynamic Phaser 
Stereo Flanger 
Enhancer 
Rotary 1-2 + OVERDRIVE 
Vocoder 
Multi 1 (EQ + Chorus + Delay + Reverb)
Multi 2 (Equalizer + Pitch Shifter+ Delay + Reverb)
Multi 3 (EQ + Flanger+ Delay + Reverb)
Multi 4 (Phaser + Delay + Chorus + Panning + Reverb)
Multi 5 (Vibrato + Delay + Reverb)
Modulation / Delay / Reverb
Reverb / Reverb / Delay 

You can find all algorithm diagrams and their parameters in the additional PDF manual. 
Just search on Google: "Roland RSP-550 Algorithm Guide" 

RETURN POLICY
1. You must tell it to us within 30 days after you receive items.
2. The shipping cost to return product must be paid by you .
3. You must be responsible for any damage before we receive returned items .
4. All items must be returned in a re-salable condition .

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Worldwide shipping 10-21 days.