It’s great to see the Quad Operator from Humble Audio ready for release. Luckily I’ve had a prototype for a while to play with and a final unit here for some videos too (see below, full demo coming soon). The Quad Operator is a no menu, no screen, totally open quad oscillator FM network. Algorithms are determined by the knobs and CV, want feedback – turn the knob up, want a different mod routing – turn the knob up … simple! Great sound and highly capable of a huge range of FM synthesis tones and types.