A 4-pole ladder filter is at work here alongside two ADSR envelopes and a multi-wave LFO for a wide range of sounds. A retro-styled front panel offers knobs for each function plus a glide feature with selectable options. You can easily connect a MIDI device over USB to play notes and you'll have the ability to save up to 128 presets. The Sirin also comes with free editor software so you can futz with all the parameters on your computer -- again, thanks to USB connectivity.

If the idea of a somewhat affordable Moog synth grabs your attention, you'll want to act fast. The company says only 2,500 units will be produced in its North Carolina factory, and after that the Sirin will retire for good.