ESKO-100 has been made in 1970x in the USSR, at the same factory as the famous Polivoks synthesizer.
It has warm and fat effects, good for guitar or vintage keyboards!
Unit's sound very experimental, interesting and in some applications even noisy, 
but sound is really unique - just like from 60s and 70s!

The effects unit has a microphone channel (M) and an electric musical instrument (EMI) channel with effects for electric guitar,
and each channel has two inputs and an output.
The effects unit contains a digital electronic single-channel reverb with controls:
- recording level;
- volume of room modulation;
- signal decay time.
In the reverb, switching modes of operation are possible:

- Memory Enable (infinite repeat);

- "FLANGER" mode;
In the "FLANGER" mode, you can change the Depth and Frequency of the modulation.
The effects channel converts the electric signals of the guitar, allowing you to achieve such original sound effects as:

- "FUZZ" mode, obtained by turning on the corresponding switch button.
At the same time, the signal from the pickups of the electric guitar is amplified and limited, which creates a characteristic sound,
already widely known under this name;

- "ORGAN", obtained by simultaneously pressing the "FUZZ" and "O" buttons.
In this case, the reproduced signal is close to the sound of an electric organ, and the volume of the sound is determined by the volume of the guitar;

- "SHMITTER", obtained by turning on the "FUZZ" and "SHMITTER" buttons.
In this case, higher frequency harmonics are added to the sound of the FUZZ.

When playing the guitar in FUZZ, ORGAN, SHMITTER modes, it is recommended to extract the sound in the middle of the sounding part of the string,
and move the switch on the guitar to the position corresponding to the lowest register or the maximum output signal;

- "VIBRATO" obtained by pressing the "VIBRATO" button.
In this case, the signals from the guitar in any of the above modes are modulated with a low frequency tone of approximately 5-15 Hz;
the modulation depth and frequency of the VIBRATO generator are set by the respective DEPTH and RATE controls;

- "TIMBER VIBRATO", obtained by turning on the pedal with the PEDAL toggle switch and the "VIBRATO" and "SHMITTER" buttons.
The depth and frequency of the Timbre Vibrato are set by the DEPTH and RATE controls;

- WAH-WAH (WOW, WAU) effect obtained when the expression Pedal is turned on with the PEDAL toggle switch.
The control of the tuning range is carried out within narrow limits and smoothly by a pedal,
within a wide range by switches, on which the frequency range is conventionally shown by musical notation.
The WOW effect can be used simultaneously with all effects.

Delay - modulation freq. min/max, modulation depth min/max, flanger/reverberator, record/memory.

All metal construction and very heavy!
Weight approx. 8.5 kg !!! (about 10 kg with package)
This echo machine is in great working condition and fully serviced before the sale.
Comes with pedal, cables, papers/schematics.