Before Mutable Instruments became on of the most popular developers of modules for Eurorack synthesizers, they created some amazing DIY synths, including the Shruthi, the Anushri & the Ambika.
This video, via Recbutton, offers an overview and demo of the Ambika, a hybrid polyphonic synthesizer.
The Ambika design consists of a motherboard and 6 voicecards, each of them carrying a ‘turbocharged’ version of the Shruthi hybrid synthesizer. This synth architecture features digital waveform synthesis paired with analog VCF/VCAs.
Whether you want to use this as six monosynths, a six-voice polysynth, or anything in-between is up to you: MIDI channels/keyboard range/patches/voices are distinct concepts, allowing complex layered, split, multitimbral setups. In addition, each voice has a switched individual output.
The second video features audio demos of the Ambika:
The design of the Ambika is freely available, with a Creative Commons (cc-by-sa 3.0) license.