The long awaited ESI Xsynth is now available to purchase. This ultra-thin 25-key synth features an integrated master keyboard and audio/MIDI interface, and is ready for music-making on the move.
This 4-in-1 instrument offers 25 touch sensitive keys with polyphonic aftertouch, MIDI and audio interfaces, synth functions with real-time encoders and information on the built-in display.
Smart buttons provide features like Pitch Bend, Modulation, Hold, allow the change of the keyboard Octave range, Glide and you can enable or disable the powerful integrated Arpeggiator of Xsynth.

Key Features
- virtual analog subtractive synthesizer based on sample ROM
- 25 full size velocity sensitive keys with polyphonic aftertouch
- aluminum body, ultra-thin and portable
- polyphony: up to 10 voices
- 3 oscillators, 3 LFOs, 3 AHDSR envelopes, 16 mod matrix slots, 3 effect sections / EQ
- patch memory: 512 sounds (4 banks of 128 patches each)
- arpeggiator, glide, octave shift, hold functions
- pressure-sensitive modulation and pitchbend
- 4+1 encoders
- headphone, line out and aux in via 3.5mm (1/8″) connectors
- USB-C connection to Mac / PC (or other mobile devices)
- bus-powered
- 3.5mm (1/8″) MIDI input and output
- 24-bit / 96kHz audio interface (recording of synth engine and aux in directly to computer), fully class compliant
- works as MIDI interface, Xsynth itself via USB MIDI plus MIDI I/O can be bridged to USB
- free editor application for Mac, Windows and iPad
- EWDM / ASIO driver for Windows 10/11 available
- dimensions: 387mm x 148mm x 27mm, weight: 634g



