Dove Audio is running a Kickstarter to fund its "Window Transform Function Oscillator," and it's worth a look and listen.

The Window Transform Function (WTF) Oscillator provides an unusual, yet user-friendly way to combine aspects of two waveforms—one in "front," the other "behind"— using the analogy of opening a window between them. As you'll see in the videos, the small screen on the front panel displays the process in real time.

According to the description, the module will include 32 waveforms as well as tunable noise (all CV controllable), pulse-width modulation capabilities, rear-wave inversion, and a dual-window mode.

To see and hear the module in action, check it out on Kickstarter