Special editions of the keyboards, placing them in more stately and Moog-like ... there are multi-voice modes that chain adjustable "mini synth panels" to provide more complex tones, stereo effects, ...

The SteelSeries Apex Pro Mini (Gen 3) is a compact 60% keyboard using Hall Effect switches, and it's good — but other ...

complete with a full-sized keyboard spanning two octaves and a MIDI interface. Korg Introduced the Monotron analog mini-synthesizer back in 2010. They also dropped the schematics for the synth.