Velvet performance oscillator

This is a sort of a rewind for me back to doing free electronics/oscillators/art synths, this one is a single square wave oscillator with a few features to make it work well as a performance synth. On the top face is a pitch knob and a slide switch to select between the two gate modes: oscillator on/gate to mute or oscillator off/gate to turn on. This is the gate method i used on an earlier oscillator box that i did in 2008, it's a pretty useful combination because it gives you both a constant tone without having to be touching the box (e.g. tweaking other knobs) or to use the oscillator as an accent/splash/rhythmic tone in the normally off position. The slide switch on top also switches between two points in the oscillator circuit, the square wave output and a slightly triangular waveform. On the right side are two buttons, the gate and a tonal shift momentary button that softens up the tone a bit. On the opposite side is the 1/4" output jack that also switches the unit off when the jack is removed. The physical layout is set up so that you can hold it in your left hand, the cable exits above your thumb, and your left index and middle fingers hit the two side buttons. The pitch knob and gate mode switch can be manipulated with your right hand or if you're tricky you can also work the pitch knob with your left thumb. The box is a copper plated project box, the stripes are adhesive backed black velvet which gives a nice visual accent and also gives a really nice tactile feeling. The oscillator circuit is an opamp based square wave with the second half of a dual opamp configured as a follower to buffer the second waveform output. This was a lot of fun to put together and even more fun to jam on, the high frequency oscillations have a really nice warble/pitch fluctuation and the low end square waves have a nice sharp edge to them. This was basically a one-off but I'm thinking about making more similar to this soon...