This is open-source hardware that started as an emulation of the FM synthesizer of the YAMAHA DX-7. The current version is not limited to FM sound sources, but incorporates various synthesizer sound sources, drum sound sources, samplers, sequencer master mixers, MIDI integration, and various other conceivable tools. Also, firmware development is actively underway, so I expect new features to be added in the future. I am selling it because it has too many features for me to use. The protective film on the display has not been removed. Please search for more details. External MIDI devices can be used via USB or mini-TRS jacks (DIN MIDI when using an adapter) from the sequencer's 2x16 MIDI channels. MIDI CC can be mapped from external MIDI devices to control inputs/parameters. Global plate reverb, two global delay effects Two instances of a "virtual analog" monosynth with one OSC, PWM, multimode filter, and noise. An 8-voice polyphonic oscillator based on the code of Mutable Instruments - Braids. Although it does not have a wavetable, it has individual envelopes and multimode filters added to each voice. A significantly improved sequencer with 8 tracks, 16-step patterns, 16-step pattern chains, up to 16384 song steps, an arpeggiator with 1/8 to 1/64 step, arpeggiator patterns including Euclidean settings, and playback of pitched drum and instrument samples. Search terms: TB-303 TR-505 TR-606 TR-707 TR-808 TR-909 MPC SP-1200 Drum machine Analog synthesizer Roland Casio Yamaha Korg Ensoniq Akai Roland KORG YAMAHA AKAI ENSONIQ E-MU ARTURIA DTM DAW Nord BOSS Nord Lead Synthesizer Sampler DJ mixer Sequencer DAW Modular synthesizer