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"The Mk2 version has the PCB parallel to the faceplate, meaning it's not as deep as the Mk1.
The M15 is an outstanding triangle core oscillator. Sine, triangle, sawtooth, square wave with variable pulsewidth ouputs and the morph output. The morph output is a waveshaping output, with a switch that selects it's output to either be sine to sawtooth or sine to square. The morph circuit is an almost exact copy of the waveshaping function used in the Buchla 258. The morph function is controllable by both a pot and a CV input, which creates very interesting effects due to the vactrol used in the circuit. All of the raw waveform outputs sound absolutely amazing. The M15 definitely has a 'fat' sound to it right off the bat, it just sounds huge. The sine wave is probably the nicest I've heard from any oscillator in my entire life.
It's very flexible in regards to FM synthesis, boasting a linear FM input and two exponential FM inputs (one of which is bipolar). The linear FM input is very musical sounding and can work for both musical scale patches as well as wild experimentation. It excels at creating various natural sounds, including metallic instruments, wooden sounds and of course, the classic bongo (especially when paired with a nice low pass gate). It has a 1v/o input, which I've calibrated to track for 5 octaves. This range can be extended by following the calibration procedure, but I only had a 5 octave keyboard to work with. It's easy to dial in tuning once it's warmed up, as you have coarse and fine tuning options on the oscillator. The oscillator also includes a sync function.
The pulse width is an interesting feature of this oscillator, as the whole range of it is covered by about 30% of the bipolar pot's manual movement. It also has a CV input to control the pulse width. The reason for this range, is to create interesting experimentation with pushing the waveform past it's thinnest pulse wave, resulting in the waveform cutting out. Sending a random voltage generator to the pulse width modulation input can create superb sounds."
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