The SX1000 did not feature an arpeggiator so we decided to borrow and expand an iconic arpeggiator by a classic analog poly-synth: the Roland Juno 60.
It features:

• up, up & down, down, random mode
• 4 octave range
• adjustable rate and sync
• hold/latch mode
• note order (pitch, key pressed)
• chord mode

The SX1000 includes a set of four high-quality effects, inspired by classic gear and designed to complement the synth’s character.
The effects section features:

• Tape Echo, based on our Space Echo emulation Outer Space
• Spring Reverb, adding classic vintage reverb
• Wave Folder, for rich harmonic distortion inspired by the legendary Serge Wave Multipliers
• Flanger, BBD based, capable of everything from subtle modulation to swirling textures

You can rearrange the effects in any order using drag and drop.

The JEN SX1000 Synthetone is an analog monophonic synthesizer introduced in 1978 by the Italian company JEN Elettronica S.r.l.
It holds the distinction of being one of the first affordable synthesizers widely available in Europe, making analog synthesis accessible to a broader range of musicians during a time when such technology was often prohibitively expensive.

At the core it’s a monophonic synth with a single oscillator capable of sawtooth, square, and pulse waveforms, complemented by a noise generator with white and pink sources. We have expaneded it with a full polyphonic mode, sub-oscillator (up to -3 octaves), additional controls for legato modes, velocity, and more.

The filter section features a 24dB/octave resonant low-pass filter, with a very distint and organic sound and with classic self-oscillation. It includes basic modulation capabilities: an LFO for vibrato, tremolo, or filter modulation, which we expanded with additional waveforms and sync mode.

It also features two ADSR envelopes for controlling the volume and the filter.

We’ve fully emulated the infamous MM5837 digital noise source (white/pink noise), also found in other classic analog synths like the Sequential Prophet 5, Korg MonoPoly, and Oberheim OB-X. However, you can choose to disable it, as this chip has a very short 17-bit LFSR (Linear Feedback Shift Register), which means the noise it produces repeats every few seconds. This repetition is audible and has been described as sounding like a steam train puffing, rather than smooth white noise.

The SX1000 was notably easy to modify. In fact, we modded ours nearly 20 years ago by adding a sub-oscillator using a simple flip-flop circuit. The principle is the same as in the divide-down organs. Since the original version had only one oscillator, this mod was essential for adding more sonic possibilities.